[MuseSick]

I know exactly what you mean- some day's it's just hard to find something to write.
I find personally I write best when annoyed. I'm not saying go out and borrow your best friends baby to get yourself annoyed enough to write a poem about a smelly baby who cries.
But you can use anything that you enjoy really.
Music helps a lot, Talking to your best friend, Reading other stories, going out for a walk.
It can all help. If you don't think to hard about writing and having it be perfect, it tends to come out easier.