Today you can buy gadgets to do most of what these do. It is much more fun to build your own, try variations, and tailor them to do exactly what you want.
Copyrighted drawings are under a Creative Commons 3.0 license. Unmarked drawings are public domain.
Unfortunately Microsoft refuses to support SVG files (part of the HTML standard for many years) so you will need to use Opera, Firefox or one of the many other W3C compliant browsers to display the sketches.