Green flag to start. Mouse down to draw. Space to clear. B key to change background.
This is a remix of a really old project, I don't even know how I found it. I just thought it was a really cool concept, so I decided to give it a Xianthe-style makeover! Anyway, credit to @Wes64test for the original project, the concept, and the tiny bit of original code that I left intact (I updated most of it, though). All art and approximately 90% of the code by me (@Xianthe).