Due to lack of actual content, I was cruising the web today and came up with an excellent linky AND thinky.
Meet Vi Hart, who, if she ever decided to become a math teacher, would get me to actually take another math class.
Check out the doodles section of her site, that's where I've been engrossed. I have no idea what the maths actually are behind this stuff working but they do and they're fun, even if you aren't artistically inclined.
I've been playing with pencil and fountain pen for a couple of hours now... I'll probably move on to some anagrams later, just because I do words better than math or drawing, but the doodle games are an excellent diversion.