That is an interesting idea, making the trees into different species.I like the rocks and crystals.. Not so much the trees. The colors are a bit too... solid I guess, and don't serve any real utility just using vanilla woods. If the different color trees were different breeds with purpose, a la forestry, or new wood colors, sure. Would be cool.
Do whatever makes you happy in the end though, I play with GeoStrata and without dye trees at the moment. if you move crystals to Dye Trees, I'll just use the trees.
I do love the idea of another big name magic mod though, and I do love your work.
Maybe I just need a texture pack to make the trees seem a bit less saturated.
edit~
ChromatiCraft has a nice ring to it lol
And ChromatiCraft it is.