I'll be the first to admit that this fundraising strategy isn't for me. But I have a wife and kids, so maybe, a few years back, I would have given this one a shot.
The strategy: renting out the extra space in my apartment or house to travelers on a budget.
For three entrepreneurs, this fundraising strategy took on a life of its own. The three entrepreneurs, Joe Gebbia, Brian Chesky, and Nathan Blecharczyk, used this creative fundraising strategy (renting out the extra space in their apartments) to generate revenue after they quit their jobs to become entrepreneurs.
But, interestingly, they found the strategy so successful, that that turned it into a business that is now thriving.
The business, Airbnb  is essentially the "eBay of space." It works like this...People list their apartments and houses (if they aren't going to be home), and even spare guest rooms, futons, and couches on the site and set a price per night. And then travelers who are looking for a place to stay search the listings for an accommodation that's right for them.
So, real estate owners and renters earn money, travelers get a discount, and Airbnb earns a 10% fee on all transactions. A true win-win-win. As you might imagine, Airbnb is doing very well, and is now in over 1150 cities in 82 countries.
My takeaways/lessons here are two-fold: first, if you have extra space or are traveling, you should consider listing your space on Airbnb to generate some revenues to invest in your business. Second, as this company illustrates, you can never be too creative in coming up with ideas to fund your business.
If you want to see a brief video of the Airbnb team, including their story of how Barry Manilow's drummer is one of their top users, here is a cool clip: