There are a lot of different POV projects you can visit if you are having any plan for building your own RGB LED POV globe like:
- n00tron 3D volumetric spherical display – interactive exhibit
This is an interesting project. Instead of putting the LEDs on the outside of the ring they put them on the spokes of a bicycle rim. Then they spin the bicycle rim on 2 axes simultaneously creating a 3-dimensional Volumetric display. The display is pretty random but still really interesting to look at.
- POV Globe
You will like the mechanics of their set up, and they go through the project step by step explaining all the problems that they had in the build as well.