Are you interested in natural things? There are MANY things you can use that may already be in your kitchen to get great colors.
Turmeric will give you a nice orange/gold.
Carrot juice (instead of water-- use the same amount called for in the recipe) gives a nice pumpkin-pie orange.
Cocoa powder -- light to dark brown, depending on the amt. used
A Whole Cucumber- (take out the seeds, leave the peel). Puree in a blender or food processor. Weigh it, and add enough water to equal the water weight called for in your recipe)- you'll get a yellow with little flecks of tan/green.
I've also used Pop Mica's from TKB Trading
Oxides and Ultramarines from WSP
I haven't used any dyes or lakes, but TKB has a great selection of those as well.