Сега се разтърсих и намерих няколко сайта...
http://www.iconico.com/cssscrollbar/
http://rainbow.arch.scriptmania.com/tools/scrollbar/colour_scrollbar_generator.html
http://www.maketemplate.com/scrollbar/
http://www.htmlbasix.com/scrollbargenerator.shtml
http://www.webmaster-affiliates.net/color-scrollbar.php
http://www.dreamweaverresources.com/tutorials/coloredscrollbars.htm
Или направо:
http://www.google.bg/#hl=bg&source=hp&biw=1280&bih=834&q=colored+scrollbar&aq=5&aqi=g1&aql=&oq=colored+scrol&fp=5bb43cbeab76c8d7