Whether or not you like Prince and his music, I think most people would agree his logo is an excellent example of icon design. It symbolises his music and ethos well, and is a very recognisable symbol.
I thought it would provide a good subject for a 3D rendered logo. This was produced in Illustrator using the 3D Extrude and Revolve tools with custom perspective and lighting. Although the 3D tools in Illustrator are quite basic you can create some simple but effective designs with a little practice.