I don't know about what other people do when they're bored, but today I played around with
drawing nebulae.
Mine ended up a little all over the place because I played with it too much. I don't know what I did exactly but at one point it started making black vines even though I had white selected...
Anyway I don't know how much drawing fancy space things interests people, but if you do check it out feel free to post whatever you make:)