IE ScrollBar FreeStyler Plus is the utility tool to help you design your scrollbars.

You can define a base color and let Internet Explorer automatically color all the scrollbar elements in shades based on that color. You can go deeper and specify colour for all the parts of the scrollbar.

You can also save your scrollbar color schemes to a file and re-load them into the program at a later time to change any color values or re-generate the code for another page should you lose your original code.