Recently, one of my favorite programs (LuBan 3D) added the ability to make spinners from certain STL files. Here is Spock's head as a spinner. Now, to be honest, it doesn't spin that great, but with practice, it will spin. I have included the STL file under the Download STL/CAD Files section. This comes with a free commercial license for those who wish to sell their prints. I also have a Batman spinner.