I had a great idea for homemade whiteboard items. I find that magnetic aids don't always work because the less expensive white boards don't have a metal backing...
Remember colorforms? little pieces of vinyl that you could use to make shapes and stick them on the wall? well, get some white vinyl, draw on an instrument panel in permanent marker, cut out some airplanes, and voila!! no more drawing airplanes that look like sick porpoises!! the best part is that you can stick them to any whiteboard or any flat surface (window, wall, etc.) and then draw all over them with dry erase markers.
I don't know anybody else who does this, but if you can find a good supplier for that soft vinyl stuff let me know!!