My favorite (and forgotten) hobby
I used to love to paint. I am not that great at it -- OK, I am not good at it at all -- but I used to just love to get large canvases, fun textures, gels and paints, and paint away. When I was in college I lived in Japan and studied Japanese ink painting there -- I LOVED spending hours grinding up the paint, sitting on my knees, listening to music. (It was the closest I've come to meditating...)
Unfortunately I spend no time on these hobbies now... I do have a silly hobby, which is collecting great notebooks and writing pads. I can spend hours (and too much money!) at a stationary store and I have all the different notebooks for different things -- personal to-dos, work, etc.