I have come across this website called Bitcoins Brain recently and it is very interesting.
https://bitcoinsbrain.com/?a55457
The way it works is, you make and account and deposit BTC or Cash into it. You'll then receive a payout of .3% of what you put in every 4 hours which is 7.2% of what you initially put in, a day.
I think it is a very good way to invest small amounts of BTC. One key thing to remember is that websites like these do tend to come and go, so the earlier you sign up and make your earning the better off you are.
This website in particular claims to have a system in which they are able to buy sell and trade coins so that he maximum profit is made for them after they invest your coins you deposited. Which is when you get the .3% ( every 4 hours of course).
If you are interested in joining please use my referral link below, a click goes a long way :), keep calm and bitcoin on!