How do you find ideas?

I just got out of DevBootcamp and I want to practice Javascript, backbone and more ruby/rails...

Ideally I would love to be working on a simple, funny, original little project where I could practice! I'm already working on www.swiv.co to work on my Ruby, but now, I can't find any new cool idea to practice javascript.

I keep bumping on things making me think "aw that was a funny idea!" but can't find my own anymore.

Where do you get inspired?