BMP bump applied to a lattice quad, (same Method Pidjy used). I tried a noise filter and it looked too uniformed. Then I took a star field I use frequently that I generated in Universe Image creator. Filled the selected Quad area and used that for a bump map.

Uploading the BR5 file to my site right now, once it's done I'll post a link.
I tried onpening the file in BR6 and exporting it as an obj file, It cuts down the detail too much.

BRB

Here's the File

http://rodsart.net/Freebies/PlanetRing.zip

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Ockham's razor- It's that simple