I recently replaced a hallway ceiling light with a pendant, only to find that the supplied canopy was smaller (5") than the hole previously cut in the ceiling (6"). I'm hoping someone has encountered a similar problem and has devised an effective solution. (Attempting to repair the plasterboard doesn't seem like it would work.)
Ceiling – Light junction box cover does not conceal the box opening
ceilingjunction-boxlight-fixture
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Best Answer
What you need is a ceiling medallion. That's a fancy name for "a circular thing you stick on the ceiling to look nice and cover a hole". A lot of them are designed to actually have a lamp hang from them, but there are some with a big hole in the middle which is exactly what you need here. There are simple ones:
and fancier ones:
Some are white or metallic and ready to use as-is. Some are designed to be painted. You can get them online but a local store where you can really see what they look like may be better.