I dunno, with me, artist's block can only be directly related to writer's block, as I have a hard time drawing something that's 'just there'. I have a hard time making something WITHOUT giving it personality and character, so if I don't have a plot or something, I get stuck.

But, that doesn't help you. :-)

The main trick, I would suppose, is to not think of it as something to draw. Think of something to create instead. Like a character, or a new object of sorts or something. Don't worry about drawing it until you feel comfortable with it. Then it should come naturally. Whatever 'it' is.