I wanted a subtle/dark color scheme for my current IDE of choice Espresso but being as fussy as I am, nothing I found was quite right, so I ended up creating my own one roughly based on the popular Zenburn color scheme which I find is nice and easy on the eyes.
You can download a copy (file:Zenburn.css.zip). Of course you want a preview so here's a simple PHP/HTML page
PHP/HTML
Javascript
And a CSS file
Enjoy!