Everybody would love to have the Hoverboard of Marty in one of the sequel of the Back to the Future movie although it is quite impossible to do. But a desktop version of it is really a spectacular display.
One question that you may ask is how to get the hoverboard in place and the answer is the use of electromagnetic that has a laser stabilization technology. Since this is a smaller version, only 5 pounds can be carried on top of the board while each magnet can hold about 2-3 pounds.
A foam version of the board will make it more lightweight. Everything will depend on the magnetic strength.