You know what would be a useful addition to this system? "Colorful Words" a.k.a. the words of creation from the Book of Exalted Deeds or the dark speech from the numerous vile books that WotC put out.

Basically, I think it would work like this. You would first choose to get the minor words feat which gives you the powers of your primary and secondary colors. Then, if you want, you may take a second feat for the major words which only gives the power for your primary color.

The minor colorful words would not be damaging to your body when said, but the major words should probably be. Hopefully whoever makes them creates them at tier 3 level (or rogue balance point).