You can dynamically change the colour of the scrollbars. Add the following JavaScript to your file, and play with the hexadecimal colour values:
document.body.style.scrollbarFaceColor="colorname"
document.body.style.scrollbarArrowColor="colorname"
document.body.style.scrollbarTrackColor="colorname"
document.body.style.scrollbarShadowColor="colorname"
document.body.style.scrollbarHighlightColor="colorname"
document.body.style.scrollbar3dlightColor="colorname"
document.body.style.scrollbarDarkshadowColor="colorname"
A very good demonstration of this is a script written by Svetlin Staev, which changes the scrollbar colors when you move your mouse over and out of it: http://www.dynamicdrive.com/dynamicindex11/scrolleffect.htm