We also had a skit: the Joker and Harley's Bad Romance, with a guest appearance by Lady Gaga (ie me). I'm the one in the red leotard, which I made from jersey. Not bad for a first attempt if I do say so myself. We used the Glee version of the song.
This skit is one of the best I've been in: we copied the dance from this excellent tutorial. What was funny is that all but one of the dancers were girls: even Joker was played by a girl. THis is because almost all the guys we know are too repressed to dance in public :P So to the guy who played the Joker's henchman, you are awesome. I wish I had photos of hte cake we used in this skit: in the beginning we were all crouched behind a cardboard cake, with only Harley and Joker on the stage. WHen the music starts (on the words 'bad romance') we pushed the cake to the floor and joined the dance.
EDIT: I've just realised: I've actually completed one of the costumes on my list for 2011