Need a new sng challenge

I have decided that I need a new sng challenge to keep me motivated through the swings. I want to do some type of challenge consisting of 500 sng's. I am going to try and complete these 500 sng's in a months time and also try to keep my ROI above 10%. I will probably start this on July 6th. If anyone has any better ideas for a sng challenge please let me know.