My sister came up with the idea of the Battling Beauty Queens and we all loved it. First we went to thrift stores and found gowns that we would not mind ripping or cutting up. I found temporary tattoos of scrapes and cuts at the costume shop and we used plenty of those and makeup for black eyes etc.
Then we added a sling, bedazzled eye patch, knife in the back, neck brace, bandages with fake blood, broken crown, wig with large section cut off (which another beauty queen carried around, while the one with the missing hair carried a missing section of dress) and of course or homemade sashes (Miss Behavior, Miss Conduct, Miss Chievous and Miss Demeanor).
We won best costume at the contest and it was a very fun night. Make sure you give yourself plenty of time to apply all of the tattoos, bandages and makeup as the process takes some time.