It's too late now because the football season is underway but some kind of a fantasy football competition would be cool.
Everybody pays to enter 1 team & the winner gets the combined bounty at the end of the season. Not sure if people know what I mean by fantasy football but there are several well known one's online.
Hmmm i wouldn't actually mind if someone was to make one for bitcoin. It could be pretty cool, same for basketball and hockey also.
This i could see happening because they wouldn't have to "reinvent the wheel" but they could just modify it a bit and accept BTC if it was handled by someone trustworthy it could be very cool.