Addition of themes for Stack Overflow
Is there any way to change the default Stack Overflow colors and to keep that colors linked to my account?
What I have in mind is something like twitter themes.
Theme support might be nice & fun for a while, but I don't think it would be actually useful to anyone. I mean, what's the point? Stack Overflow is a Q&A site, not a social network.
If you really want a custom Stack Overflow theme, you can always write a basic userscript for it. Check out StackExchange Theme Switcher for inspiration.