Showshape is little program which can display small graphics on Workbench using transparency. You can create various elements with different forms and move them around. Think about Christmas trees, boingballs, round edges for your Workbench Screen, ann.lu logo, Bill Gates head, Speedy Gonzales and a lot more. It's real fun! It comes with nice examples.
It's downloadable from http://ultragelb.com/shapeshow.lha