Check out internmatch.com to find one. They're a 500 Startups company (most recent class), and seem to have some decent inventory on there already. Good luck!
That's awesome that you've come across an idea that excites you. However, I'd advise against leaving college. Before I get into why, I just wanted to mention that I totally know where you're coming from, as I graduated from college relatively recently with a degree that has very little to do with tech, and I definitely related to that feeling of disenchantment
1. Regardless of whether or not your startup works out, it's likely that you'll apply to/work for someone else's company one day (even if it's briefly). While there is this growing notion that one doesn't need a college degree to qualify for a position, it's not widely adopted yet and I wouldn't count on it being widely adopted in the near future. With that said, taking a leave from college and going back a year later would be an absolute bummer. If you're disenchanted now, you'd be 10X as much once you're back there, because all your peers will have graduated.
2. Even if what you're learning doesn't interest you, the experience of college is an education in of itself - in both discipline and the social world.
Regarding discipline, we can work all we want at our startups, but if we really need to take a day off then we probably can. There's no one to answer to other than ourselves. If there's a midterm on Monday, and the world is crashing down the week before, you're still going to have to take that midterm. Even if you're not into what you're learning, forcing yourself to do work you don't want to is important, and is a skill that will be necessary no matter what company you start.
Regarding the social world, the college experience is pretty key in helping you find yourself and shape yourself as a person. Right now you're a part of a journey, but if you came back a couple years later it will definitely feel different.
3. As another commenter mentioned, start the idea while you're in college without taking a leave. Ideas are merely hypotheses. Wait until your hypothesis is validated through user adoption/etc. before you consider leaving school.
4. Worst comes to worst, if you don't get to execute the idea because of college, just trust that you're going to have another killer idea. I'm sure you're intelligent and you're clearly ambitious. Ideas might have life-spans but your creativity won't.
5. Standing up on graduation day after pulling through 4 years straight is an incredible feeling, and I'm sure I speak for many of us when I say that it's a day where you're just really proud of yourself for pulling through. Unless you have a totally horrendous experience, it'll feel worth it on graduation day.
With that said, I wish I majored in CS in college and sat in on more psychology lectures :)
Interesting post! Just wanted to note though that Sequoia didn't invest the full $41 Million. The $41M includes investments from Bain Capital and the Silicon Valley Bank as well.