I tried a little experiment this week, and it worked! I had some old crumbled shimmer eyeshadow (Mac "Say Yeah") and I mixed it with a little clear nailpolish. It worked great! I put on a clear topcoat and it was as good as anything. Maybe not my favorite color for nails, but I look forward to trying some other colors too since I never use up my eyeshadow anyway (and it doesn't take much). Give it a try!