I have an idea you could do a flashgame marathon and play loads of different flashgames.Also you should do the really hard ones because people like fails.
People have suggested flash game marathons in the past. The only problems I can see with it is some streaming issues when streaming off a desktop and a lot of lag since the computer itself is streaming and running the game at the same time.
Plus, there are really only a handful of good flash games out there.
The idea has potential. Back when I did ORGs (online reality games), which were heavily Flashgame-oriented, I streamed them once or twice, and so did Cappy.