I have one trading system for ES futures. I think it can work on YM, NQ, TF also.
This is equity

Here is backtest from 1/2007 to 12/2013
60% profitable trades, PF=2, 88$ average trade, long-only.
no indicators. one optimized value.

I could change this (easy language code) to another intraday trading system for CME futures.