Diametrically opposed from Writer's Block is something called Writer's Itch.
It's when you get the desire to write even when you don't have anything special to write about. I generally like to have a nice big lined notebook for that. The sight of an empty sheet of paper is perhaps one of the most inviting in the world when you are in one of these moods.
Sometimes though I do my doodling on the blog - this is one of those entries. It is not supposed to make any sense, and - well, I guess it doesn't !