Ideas for Ratchet & Clank: All 4 One Contest?

I'm planning on entering the Ratchet & Clank: All 4 One contest (http://www.ratchetandclank.com/en_US/contest/) but I need a bit of inspiration. I'm guessing you can make any type of costume for them, like in the skins in some of the previous ones, but I need some inspiration. I don't want a complete idea. Just something that will make me go, "I know what to do!" Any help?