https://blog.gnosis.pm/announcing-gnosis-olympia-5fb7e16dd259
Olympia is a prediction market running on Gnosis, which is built on Ethereum (and then it is turtles all the way down...)
They are running a 2 week tournament where you are allocated 200 OLY tokens which you can stake on predictions. Do well and you might end up on the leaderboard, and the small but growing prediction market community will realize what a rockstar you really are.