Why are you assuming said website needs to be successful on the market? Maybe it's a personal website or a hobby project.
If I were starting now, my inspiration would possibly be things like: responsive, single-page apps, with ajax, websockets, etc.
I was going everywhere and viewing source and you could basically figure out how everything was made. Now--not so much.
It's not so much 'success' as similarity with popular projects.
Why are you assuming said website needs to be successful on the market? Maybe it's a personal website or a hobby project.