High probability of finding this fun, given that you are a math and CS nerd.
I feel the need to get good at origami. My last squirrel was pretty hideous. He committed seppuku.
large index of diagrams
joseph wu's page
jason ku (mit nazgul) not many diagrams though
From trash to treasure. Check out the shadow box I made a little while ago.
New GDS plug-in that indicates whether a file exists.
Version 2 of the Google Desktop Timer plug-in is available here. Fun new things like descriptions for the timer, stopwatch, icons, and being able to change existing timer settings.
Coming up, a couple of dumb, easy plug-ins: red light/green light (existence of a file, someone's request), international clock (been planning on this, but the dumbness of one that was published has given me motivation to finish this sooner rather than later).
After those, maybe something fun like a game.