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.

I follow the needs of an industry. If you understand an industry, you can feel which direction to take it. I've never understood how or why people would use any other method.