I have always loved the idea of decorating parts of your wall instead of the whole room, of painting something directly onto the wall rather than hanging art. But I can't even draw a realistic stick figure, so the hunt began for someone else's images that could be transferred onto a wall. Threadless.com has got some links to some great wall decorations. But I figure as a DIY, you could probably print off a picture from the net (or draw it, y'know, if you've got the skills) and print it onto a transparancy. Then get an overhead projector from your local elementary school and project the image onto your wall, allowing you to trace it on.  If you could borrow the equipment and find a picture that had thick lines for tracing, I think it would be a great project..