You could launch a contest in which some startups that would like to use the domain can offer you a small stake in exchange for the domain. You pick up the startup you like the most and lease the domain to them.
Looks like a fair change that can return something in a long-term. If the startup doesn't work in, lets say, 1 year, you get your domain back.
Good catch. Make it a forum so people can post ideas on what to do with it? Or a bit more useful: you could remake kickstarter, recreate something like DIY project sites (<a href="http://www.instructables.com/id/Magnetic-Rubik-s-Dice-Cube/" rel="nofollow">http://www.instructables.com/id/Magnetic-Rubik-s-Dice-Cube/</a>), make it a specific-category site for ideas (home improvements, meal recipes, wedding planning, etc), list it for sale and see how much you could get for it, forward it to <a href="http://en.wikipedia.org/wiki/Idea" rel="nofollow">http://en.wikipedia.org/wiki/Idea</a> - or some things that are a little more unique: make it a project listing site, allowing people to upvote projects, services, and devices they'd most want (similar to kickstarter, but no money involved, allowing you to get a reasonable idea for how viable an idea is in a rather refined market [techies who actually would go and read it]).