Ok, I was getting a bit disipointed with all the over-the top Ponzi schemes floating around, especially with all the creators taking 10% for doing nothing. So I put together my own (from scratch, no copy & paste) with 0% going to the creator and a 125% return.
Send between 100 finney (0.1 ether) and 10 ether to (like the 1.25 multiplier, the 10 ether maximum is set "low" to allow payout flows)
0x43bbc7fafb860d974037b8f7dd06b6f6fe799b3e
Source code is also attached on etherscan.io for verification purposes. It is simple, no frills, no fuss.
http://etherscan.io/address/0x43bbc7fafb860d974037b8f7dd06b6f6fe799b3e