Here is a spinning desk toy that puts on a holographic show when used with a flashlight or UV light. The Lightrix Spintrix Disc is available in various patterns. You can spin this on any flat surface. It can keep going for a couple of minutes. Bring a flash light, and you will see something like this:
The Lightrix Spintrix Disc is pretty rare but you may be able to find it on eBay.