Based on http://freestyler.ws/style/10/funky-autoscroll and DOMI. Example of how to use different images for scrolling horizontally, vertically and both. Replace the images with something nice (I used http://www.motobit.com/util/base64-decoder-encoder.asp to make base64) and post it: http://userstyles.org/style/new

*20060113 Fixed erroneous height attribute

For reference, the normal autoscroll image style is:
position: fixed;
left: [where you clicked]px;
top: [where you clicked]px;
width: 28px;
height: 28px;
cursor: n-resize; (vertical)
cursor: e-resize; (horizontal)
cursor: move; (both)
z-index: 2147483647;
border: 0pt;
border-style: none;
margin: 0pt;