Non-textured, self-illuminated objects

I would think this would be easy to do, and it probably is, but I am new to Unity so its escaping me. I would like to have some solid colored objects be self-illuminated. I can make objects self-illuminated with the self-illumin materials, but they seem to require a texture--otherwise the object just looks white. The main color seems to be completely ignored. I want the objects to use their main color instead of solid-colored textures because I want to be able to programatically change the objects colors at run-time.