Isn't that ironic? When you're not making games, ideas are just popping up. I want to make THIS, or THAT, it's going to be THE BEST game EVER!
And then when you actually start doing stuff... when you're free to do it your way... erm, what should I do now???

Imagination/freedom is a double-edged sword really. Or more correctly, we have to be constrained in some way in order to be creative.