Custom nail polish

So I have started looking into making my own nail polish- I have "franken-polished" a few colors, but I want to really make everything myself- mix the color powders or dyes, put in my own combos of glitter, the works. I've been doing a lot of nail art lately, so I have been buying a few polishes, and they get really pricey! Has anyone out there ever made their own? How did it go?

From ScrapNMommy