I have found some cool web sites and pages that provide texture enhancements, and here are the top two I found
http://q2.tosher.tu2.ru/ - This page is in Russian though
Thanks! Depending on the licensing of these textures, they may or may not be distributable with Quake2World. However, either way they could probably be used in some "unofficial" community levels, so thank you for pointing these out.
Btw, you should drop by IRC. Channel info in the page footer.