Concrete – Do these plastic molds exist

I have worked with dry color for concrete. We poured a few slabs and some curb.

The dry power was available at a concrete supply house. It was expensive, but could be bought in small bags if needed. A little went a long way.

The color powder made a huge mess and stained everything. It was the consistency of powdered sugar. You need to mix it really well with the dry mortar or you will end up with varying color. You need to test the color by mixing up and curing a sample as it is hard to know exactly what the color will look like until it cures.

In this case, I would skip the color and use polymetric sand. Something like this: http://alliancegator.com/2011/?p=21

I would be more concerned that your wire looks to be at the very bottom of the concrete, making it useless. Concrete is very strong under compression but very weak under flex. The steel is there to take the flex and should be about center of the concrete. Definitely use a concrete bonding agent and Ditra. The Ditra will provide enough of a barrier that the cracks should not come through. Personally I would not put a huge pile of money into tile considering it might end up cracking