I have just launched my site with a theme that I have made myself completely from scratch.
It uses multiple colour sets and some ‘grunge’ style imagery. Let me know how you like it, and if you come across any bits and pieces that aren’t working.
The site uses CSS 2/3 and xHTML code, with a heavily modified version of WordPress 2.6.02.6.1
I have made all hacks to WordPress 99.9% upgradable so should be good to go with upgrading to the newly released WP 2.6.1. was simple.
I hide all CSS and JS with some simple PHP code and have a colour changer in the top right. This sets a PHP cookie for 7 days on your computer, and nothing is harmful about my cookies 
I have built in the CSS/JS for the plugins is use to reduce code and scripts that WP inserts, I really hate how if you use a couple of plugins there gets a mess of included files in the <head> of the pages.
Check out my source code, it is pretty, and you can’t view my CSS and JS files