Got any examples of these colours so we can see the contrast? Orange or blue seem like they could work.
I have to say though, I'm a fan of the normal white. Titles or tags look fine, but something about seeing different coloured usernames makes me read the post differently, and I honestly can't explain what I mean by that. If it's different, it should be very subtle. A light pastel blue or something along those lines at least.Just something that doesn't stick out in your peripheral vision while reading a post.
Are we all in agreement with a single color? Or would people be okay if there was 1-3 (maybe 2-4, but that's at most) colors for donators to choose from? So long as those colors were ones everyone agreed looked alright? Because personally I'm partial to blue and green, they look great, I just think people would appreciate the ability to choose a color from a set of "approved" colors as it were.
If we have to choose just one, I wouldn't mind green at all. I just like the blue as much as the green.