BitBond is a P2P lending site where you loan to people and earn pretty decent interest too,haven't tried it yet but Ive heard good things about them.
also if you choose to invest with them try to find people with lots of repaid loan. Higher chances of you getting paid back
For me i think its good to invest btc as the value dump down and up with a big distance. Its more useful to have that kind of coins that we know how this would work through the year. And it would be known to us if invest for it then we will be more great full in the year comes
I'd exercise caution when using p2p lending services people always try to scam others so don't put down too much without any sort of security or collateral.