Short Answer
Having been part of the Savage Worlds community for years, I have not seen a more complete list of powers with Pathfinder-like trappings than Zadmar's Savage Spellbook. This is because in general Savage Worlds favors a "the player and GM agree on the trappings" attitude, which is different than the D&D / Pathfinder "every spell has explicitly defined trappings" attitude. The idea is that by having a short list of spells you can customize with your own trappings, players can pick what they want and then fine tune it much more quickly, allowing for more Fast! Furious! Fun! gameplay.
Put another way, Savage Worlds is "pick the trapping, then build the power around it". D&D is "pick the power that includes the trapping." If you're converting from Pathfinder to Savage Worlds, you'll also have to change your mindset about how spells are defined because both systems make different assumptions.
Long Answer
There are no comprehensive lists of trappings, official or fanmade, for Savage Worlds powers because not only is there a different mindset for how powers work, but it's easy enough to just add your own trappings to fit whatever concept you want. If you want "classic D&D trappings", you can do that. If you want "crazy archetype-inverting fantasy trappings", you can do that. But the moral of the story is that it's easy to do it yourself; you don't need a giant list. Here are some guidelines for how to do it:
Some D&D Spells Are SWD Powers with an Elemental Trapping
Savage Worlds Deluxe introduced several elemental trappings with example effects. For instance, an attack with the Acid: Corrosion trapping can ruin armor. Just take bolt and slap on that trapping and you have Melf's Acid Arrow. Use the Fire: Flammable trapping instead and you have Scorching Ray.
This is pretty much what Zadmar's Savage Spellbook did. You'll notice that each of the entries has a note at the bottom saying which trappings they used; they pretty much just picked a trapping, made any logical extrapolations from it (e.g. a sound-based trappings are bad during stealth missions), and fudged any numbers that they felt were appropriate to balance any added effects.
For combat spells, you can get pretty far by just doing this. Again, there is a paradigm shift in that players are expected to make up their own trappings, with the agreement of the GM.
It's Not That Hard to Create Your Own Trappings
Say that Magic Missile is an important part of your D&D character, especially the fact that he never misses with it. Having bolt automatically hit, regardless of cover and wound penalties, is far too powerful for Savage Worlds, but you can invent several similar trappings to replicate the idea of it not missing its mark. Here are a few possibilities I came up with:
- Magic Missile is bolt, but you can automatically aim if you don't move (basically the Marksman Edge applied to this power)
- Magic Missile is bolt, but you ignore one level of cover (i.e. Heavy becomes Medium, Medium becomes Light, Light becomes none)
- Magic Missile is bolt, but you ignore up to two points of Called Shot penalties
As long as your GM is okay with what you're making, you can pretty much do whatever you want. Again, that's a different mindset than Pathfinder, where you're encouraged to stay in the bounds of the listed powers, rather than encouraged to create something and find a way to make it work.
Sidenote: What About All The Non-Combat Spells?
One complaint I've heard about Savage Worlds is that there aren't many non-combat powers. I think many people miss that there is a paradigm shift: In D&D, you have a spell for just about every arcane trick you can pull off. If you don't have the spell, you can't do it. In Savage Worlds, you have a spell if it is important enough to be used in a matter of life or death, generally because they have a combat effect. If you don't have the spell, it either means it's not noteworthy enough to list it on your character sheet or your character just didn't care to learn it (perhaps their training was in destructive spells, but not so much conjuration or illusion spells).
Some Spells Don't Belong, Because a Wizard Can Just Do It
Minor D&D spells such as Cantrips, Read Magic, Mage Hand, Mending, and so forth don't exist because they're considered so basic and inconsequential that it's not important to track them on the character sheet, so wizards can just do them so long as the GM and player agree. You just make a Spellcasting roll (or whatever arcane skill you are using) to create fireworks, look over a scroll, pick up a potato with your mind, or fix a torn garment. Any wizard worth his salt can do it, so long as it makes sense for the character (if they never bothered learning illusion, they can't conjure up a ghostly image when telling a story to children).
Also, recall that the New Power Edge takes an entire advance, so all the Powers available are ones that are deemed to be useful enough to be equivalent to an Edge. A few third party settings break this rule and Savage Worlds fans tend to dislike it. There's one out there that that adds over a hundred new Powers (more than double what's in SWD), with one being a power to make wet things dry and dry things wet. Not really on par with bolt is it?
Some Spells Can Be Rolled in With Other Mechanics or Spells
One thing I've seen is that when a player wants to use magic to do something with a more consequential effect, the GM tries to roll it in with another rule in Savage Worlds. Say that the wizard wants to create a Ghost Sound to distract an enemy. That's pretty much a Smarts trick, although the GM might choose to make it Spellcasting vs. Smarts instead of Smarts vs. Smarts. Calm Emotions is pretty much an out of combat Performance vs. Spirit. Again, a spellcaster can generally just do it, so long as it fits thematically that they can.
Also, some D&D spells are really just more specific applications of Savage Worlds spells. Knock is probably just boost trait applied to the Lockpicking skill. Rage is warrior's gift granting the Berserk Edge. Feeblemind is lower trait applied to Smarts. In reality, you already have many of these powers already.
Final Thoughts
There are 390 spells in the Pathfinder core book for wizards/sorcerers alone with 50 in Savage Worlds Deluxe. There is not a one to one conversion between the two, and that's because there are different underlying philosophies for what sort of spells should be on the character sheet and how much player involvement there should be. A few lists are out there of well defined trappings, but they are generally efforts to convert a D&D mindset into a Savage Worlds mindset, so they are rare.
My suggestion is just to embrace the Savage Worlds mindset and invent trappings of your own to match the powers that your Pathfinder character had. It'll save you a lot of time, and you might like it!
Best Answer
Trappings and Powers
With the core rules as written, you choose your Trapping at the same time you choose your Power and there is no way of changing it after that point. If you wish to have a different Trapping for a Power you already have, then you need to get that Power again.
As far as I can see, there is nothing that explicitly states this to be the case in the core rulebook, although there are a number of points through the 'Trappings and Effects' and 'Powers' sections where it is implied. For this reason, you need to go to the official forums for clarification, and this post* confirms the above interpretation.
However, this only applies to the core rules. Individual settings and supplements may differ in their implementations. For example, several of the expansion books allow powers to be chosen on the fly (like Super Sorcery in Necessary Evil, which also allows you to choose a new trapping each time). This is also one area where it is common for GMs to house rule, and a search of the official forums will find plenty of suggestions for how to go about doing this.
Boost/Lower Trait
Boost/Lower Trait is a different matter entirely. Both Attributes (Strength, Agility etc) and Skills (Fighting, Intimidation) count as Traits, and you choose at the point of casting which Trait you are going to target.
The first line of the Power description confirms the above interpretation:
It is also worth noting that a lot of confusion with Savage Worlds rules comes from assumptions and 'filling in the gaps'. In this case, there is there is nothing in the Power description that limits its use to an individual Trait, or anything within the rules that links the Traits you can effect to the Trappings system. Confirmation of the above interpretation can be found in this thread* on the official forums.
Boost/Lower Trait however is one of the more common powers for settings to alter, as in its default form it is extremely flexible (this doesn't necessarily mean it is overpowered in this form though, just that individual settings tweak it to give a different feel). Some, such as Shaintar, split it into two individual Powers, one for raising and the other for lowering Traits. Other settings such as Hellfrost limit the Traits that the Power can be used on depending on the background and flavour of the Arcane Background.
*It should be noted that Clint is the official brand manager for Savage Worlds, and his answers on the subforum I have linked to count as official rules interpretations and are effectively RAW.