I like the slightly darker Purple. The really darker purple is bomb diggity too, but it makes the white stand out that much more. Blue needs to go away. I guess I'm just tired of seeing blue.
As for the CSS sheet, wouldn't you just hafta make one...and then give them out to whomever wanted to see a different color? Then they'd just edit it with the color they wanted, and boom, less work for you? In fact, since this is VB, shouldn't this color option set be already available since you're already tinkering with the colors as is VP?