the_rck

I've got a few random generators up:

Cool Bits Story Generator: http://www.magatsu.net/coolbits/

Steampunk Story Generator: http://www.magatsu.net/steampunk/

(satire) YA Dystopia Story Generator: http://www.magatsu.net/dystopia/

The Random Art Prompt Generator is geared towards visuals, but some of the prompts might work: http://www.magatsu.net/art/

The Fantasy Art Generator is slightly more storylike than the generic art generator above, but has terrible, terrible grammar because I haven't ever gotten around to fixing it: http://www.magatsu.net/fantasy-art

edit:

Seventh Sanctum has a bunch of generators. This link is to the specific Writing Generator page, but poke through his others as well:

http://www.seventhsanctum.com/index-writ.php