Sick of that dirty green color on your HPC's desktop? Change it with ColorTweaker! And change the color of just about anything else you want - buttons, menus, text etc.
Supports color schemes files - save your favourite scheme to a file so that you can reload it later, or start your own collection of color schemes.
Also has a "Restore Default" button, which restores Windows CE's GUI to its original colors - in case you've messed things up real bad.