What problems or repetitive tasks do you face on a day to day basis? Odds are others do too. Find a way to mitigate or address these challenges in a simple web friendly fashion. Evaluate the market to ensure your not getting into an overly addressed problem/task. There are so many things working against you when you clone or mimic a site. Take the easier road and contribute something new.

It sounds elementary and glamor free but it is a proven methodology.