You'd need someone to decide what's "bad ass" to include. Voting/filtering might come in to play, but it's hard to tell, and you usually only have the company's explanation of a job to go on (and those usually aren't accurate).
TheLadders.com has made a nice job of segmenting off and servicing a "100k" jobs market, but salary is one thing that's pretty easy to determine in a job. It may be a horrible job, but if the ad says "$130k", you know what you'll get paid.
"bad ass" is in the eye of the beholder too - your job is rotting your brain. Someone else coming in to the field might consider it a real challenge and growth opp. I don't know your job, so perhaps that's not accurate, but I've seen it myself. Other people have come in to positions I've hated and they've thrived.
On the whole it sounds like a tempting idea, but my thought is that, without some serious time/effort to filter and interview the employers, it'd be really hard to do well.
Now... you could charge the employer a decent fee, but give them a few video slots, with interviews/pitches from various team members you'd be working with - turn the interview process on its head slightly. Companies willing to go through the process of really selling themselves and a particular position beyond just one simple list of bland bullet points might be considered badass just on that point alone.
mgkimsal@gmail.com if you'd like to consider dicussing or pursuing this more.
Rereading your post, I don't think the issue is particular jobs - I think it's you. You're ready for freelancing. The most challenging/particular things (I've found) have come from short term consulting projects. Come in , problem solve, execute, leave before rot sets in. This is the sort of thing we'll be promoting at http://indieconf.com in November :)