Here are some ideas:
-witches (good or bad)
-police officers (with a cute mini skirt or something)
-dumb blondes (with high heels and such)
You can go to any thrift shop such as D.I. or Savers and find dresses for fairies, angels, princesses, etc. You could also just dress up crazy in the same color or different colors!
Here is a link for some faries and such! There are lots of more ideas on that site! Good Luck!