On my site I use this css code to customize the scrollbar :

Code:
<!-- START HERE TO COPY & PASTE THIS CSS CODE AFTER YOUR TITLE TAG TO MAKE THE SCROLLBAR CHANGE COLOR -->
<STYLE type="text/css">
BODY {
    SCROLLBAR-FACE-COLOR: #000000; SCROLLBAR-HIGHLIGHT-COLOR: #006400; SCROLLBAR-SHADOW-COLOR: #006400; SCROLLBAR-3DLIGHT-COLOR: #ff0000; SCROLLBAR-ARROW-COLOR: #ff0000; SCROLLBAR-TRACK-COLOR: #a0522d; SCROLLBAR-DARKSHADOW-COLOR: #000000
}
<!--
    A { text-decoration:none }
    -->
</STYLE>
<!--THE CSS SCROLLBAR COLOR CHANGER CODE STOPS HERE------>

It looks like this :

Click image for larger version

It's just my opinion, but I would like to see a nice colorful scrollbar on this Forum.

Whoever is in charge, please give it some consideration.