Here's an old concept from FPSB. The idea is to make shapes or motions with the hands while executing a trick, often a stall.

http://www.youtube.com/watch?v=AMkNRMvefpQ (heart)
http://www.youtube.com/watch?v=2mn8wMGWOJ8 (dog)
http://www.youtube.com/watch?v=QZZv9_pIS20 (eagle)
http://www.youtube.com/watch?v=sWO0nqZu614 (\m/)
http://www.youtube.com/watch?v=kvPObfyMbFE (spider)

http://www.youtube.com/watch?v=vmqNmTB26wc&eurl (fuck you)