Hey, bro! It looks like a pretty cool idea, and it'd be cool if vanilla MC had the colored light, but with 1.7, there is colored glass, of course. If you have shaders installed, most shaker packs I believe create colored light when light comes through stained glass.
Support! I don't understand why MC didn't incorporate this early or had it in the first place. Colored light would be quite trivial to implement from what I know about OpenGL and the game's engine. It would be great to have the various light sources not only produce different light levels but also slightly different hues, as well as the sunlight itself (not only the sky coloring) shifting hue throughout the day.