Behold Bumblebee - the Two-Headed Mutant! (the other head is Lando Calrissian...)
Starscream opted for a frog costume - awww, isn't he just adorable? I think he's fishin' for snuggles, personally.
And last but not least - Mirage the Belly Dancer! He's been having...uh...maybe a leetle too much fun with this costume. He's been twirling all night, and now he wants me to make him some finger cymbals....