I went to a costume contest as part of Dragon*Con 2004 . The best of the show was Dr. Teeth and the Electric Mayhem . No one else in the contest came close. There were other elaborate and beautiful costumes but they just don’t play well on stage. It’s hard to appreciate hand-made lace and intricately sewn beads on a fairy’s gown when you’re looking at it from the seventh row.
Edit: I can no longer find photos of Electric Mayhem on Halfmoth.com, but you can still see lots of other cool costumes. If you do a google search for Electric Mayhem Halfmoth you may find some photos.