I really like making origami cranes. It's somehow very calming. I have a large stack of white square note paper I got from my friends father, so every time I feel a bit stressed or have a few minutes of spare time (when I'm waiting for WoW to load, for example...) I just grab one and start to fold.
I have a problem though. What to do with the cranes? At the moment they are sitting willy-nilly on my windowsill.