Making the viewer background changeable would be great, especially for the ships/SKINs.
The race specific background (especially for Amarr and Minmatar IMHO) can be a bit rough on the eyes when you want to see details.
It could be based on your UI theme, or just like the turret/launcher background, or heck just a flat starfield without anoms. Less abrasive would be nice. Just my 2c for your consideration. 07.