Ideas can come easy and they often do (to me anyway). Good ideas, those that can be used, explored, and developed take a little time. Idea + time=good idea.
If I’ve had a slow day, a day where I’ve let in some quiet time or distraction time, I’ll have quite a few ideas on creative projects. They usually suck. Or they would take being an expert in something I’m not an expert in to accomplish. I don’t throw those away-I write them down anyway. Those little bad ideas I have all the time contain juicy nuggets for future ideas that may work out. Refining/mining a bad idea is a great exercise in figuring out what that nugget really means. I don’t dwell on bad ideas too long–that would stop other ideas from coming in–because parts of those ‘bad ideas’ will pop up as essential and amazing components of better ideas.