Make something bad on purpose

One way to overcome Writers-Block is to try and make something terrible. Write the worst, most nonsensical piece of rubbish you can, draw like a child, play with your other hand.

The idea is to lower-your-standards-to-make-more. In this way you Start-before-you-are-ready and jump into the creative process. It also removes any pressure you put on yourself, because you are trying to make it rubbish.