Peer to peer lending is the best thing I have found this year. You can get around 5 to 7 percent interest and you don't need a large amount of capital. With all the other financial markets so volatile right now this is a pretty solid rate of return. There are always risks of default that you will need to consider, but most platforms allow you to mitigate that with automated diversified portfolios.
I had actually typed this up but deleted it because I thought the question was more about a beer-money level enterprise.