For anyone who crafts and also does their nails...you gotta check out Robin Moses on Youtube. She keeps posting the most unbelievable designs and she's all about teaching how to do them. If you've seen my videos, you know I don't do my nails...but even still, I am so mesmerized watching her.
She treats the fingernail like a tiny canvas and she uses many of the same techniques and products us paper crafters do. Often, she uses craft paints, micro-fine glitter, and foil on her designs.
If you do want to learn how to do nails, sign up on her sites and spread the word! Check out this Zebra Rainbow design--using eyeshadow pigments and The Best Glue Ever.