DJ Holloway at 2012-07-24 15:44:36:
I don't know how often I sit down with the intention of creating an idea (or at least how often I did it before I started coming to this site - now it's part of a daily routine!) but it is a little more than just waiting for ideas to strike. I think it's mostly just an openness to the possibility that I'll encounter something in any number of situations throughout the day.
An image, a feeling, a line of potential dialog, a news story, a dream, something - none are yet ideas unless I'm on the lookout for it. So I always have something to write with and write on (thankfully it's just my phone now, but for years going back into high school it was a little note pad and pen always in my back pocket) so that if a tiny glimpse of inspiration (or a full concept, as has happened before) hits me, I'm on the ball enough to write it down.
Then later, I write it in a master doc that has a ton of ideas at various levels of development. When I try to crack down on what to write next, I start there and then try to build up pieces of strong ideas into strong concepts.