the only way sure i can see for now is lending with collateral or lending on poloniex
I find this a good way to invest your bitcoins but I don't want to rely on this type of investment. I will prefer to invest more with bankroll casino or I will just hold it for longer time. And the most preferred of people here is with trading, this will never gets old.
If you are looking for casino site you try with bitdice casino. Site's games and dice are easily understandable, there is chat board to explore the things with the members. Dice is most favourite in this site for me. Automated bot in initiazed to autoplay the dice game.