Something I was going to make awhile ago, a quest site, updated every few months. The pages would have puzzles like say ummm which of these is the odd one out [obviously nothing like this]:
:eusa_whis
The whistling one because its the only yellow one so you would go to whistling.yoursite.com for the next puzzle then when you get to the end you win myspace layouts or whatever donated by people and below the prizes it says sponsered by *yoursite* so they get advertising too.