I used to dabble in sculpture and pen-and-ink ages ago, but now I  "do 3D" to illustrate my writing, or for mousepads/calendars/etc. to give as gifts (or someday sell, who knows)!  Also, in an attempt to make abstract movies that I can compose the scores to (I compose soundscapes/dark ambient/cinematographic music).

Takes up less room than clay, even though I'll sometimes rough out an idea in clay before trying to get it into the computer!