I subscribe to a couple of blogs, one of which is The Layers of Meaning. She did a post not too long ago about a blog from Hugh MacLeod and his tips for on how to be creative.
I added a widget to the side bar of the cartoons that he draws. They are cool, and I really enjoy them.
His list of how to be creative can be found here.
My favorite part of the whole thing is under #24 about Finding Inspriation. He says "If you have something to say, then say it. If not, enjoy the silence while it lasts. The noise will return soon enough."
The whole list is worth a read. The guy knows what he is talking about.