Does anyone know how to change the color on the scroll ball of a blackberry pearl...

??

Okay I have this BlackBerry Pearl, and I want to know how to change the color of the scrolling ball??

if you have the 8100 you can do it from the desktop manager i believe, you might have to download an app. if you have a different ver. of the pearl, you can't, because the scroll ball has a single color led