Well, I've seen 2 edits of the default admin ball:
-Ticonderoga's Silvery flashy one
-and the better one, Lilboarder32's rainbow ball that flashes when you spawn, and a rainbow particle jet player to go with it
So, frankly, I haven't the slightest idea of how these people do this amazing things. But I really want to know how, and if I can get a link to a test and/or a tutorial.