My project takes people's annoyance by browser miners, and is a site whose entire purpose is browser mining. There's nothing else to it. The goal is to mine 1,000 Monero (an altcoin) collaboratively. After taxes and fees, that would cover the approximate cost of 2 years in grad school. I did the math the other day and realized that with about 1 million miners, I could achieve this task in 1 week (or 1 day with 7.5M miners, or 1 month with 250k people).
I've had very little luck getting the word out. While I'd love for the internet's capricious eye to smile on me and make it take off, I'm not optimistic. Nevertheless, it was a fun learning project!
[2] https://en.wikipedia.org/wiki/The_Million_Dollar_Homepage