Feather Nails - Put down clear polish first, then apply feather while it's still wet. Trim off access and put another coat of clear polish on top. Instead of clear, you can use colored polish as your base. I think bright blue nails with yellow feathers would look especially amazing.
Winter nails! I love this. I bought some grey nail polish (Sally Hanson - Gone Grey #375) and sparkle polish (Sally Hansen Gem Crush - Glitz Gal #08), painted my nails and think they look pretty good! It was hard to make the sparkle nail polish even from nail to nail!