Changing The Mouse Cursor

Has anyone found out how to change that silly / ugly / boaring Mouse Cursor? Can you assing a new one in a .ui file? I'd like to change it to a crosshair - ala Discreet FFI & C* - as I find the arrow a bit annoying while working with a Wacom table. Nothing serious though - but would be nice Tips anyone?

thanks in advance

gisli