A look into the things I'd like to do, life I'd like to lead, man I'd like to be, items I'd like to avoid, and the adventure that occurs between dream and reality.
I think the best way to generate ideas is to stimulate your mind with other ideas. Be around creative people, read creative things, look at creative things, etc. Whenever I find that I'm having a dry time creatively, I'll just start poking around the internet and eventually the ideas come flowing. Simply because you prime the pump of creativity.