We have seen many decent Bluetooth speakers in the past. The ICE Orb Floating Bluetooth Speaker is quite fun though. It has a magnetic base and a speaker orb spinning above it. The speaker connects to your smartphone via Bluetooth or NFC and has a range of 10 meters. The floating Bluetooth speaker achieves 10mm ground clearance.
The ICE Orb speaker has 10 hours of battery life. The base has a USB port to allow you to charge your smartphones or tablets right on your desk.[Source]