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:
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Date: 2017-07-21 05:23 pm (UTC)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