Check out this Scribble theme, is this the one or similar to the one you want? this is a .zip file so you have to download it to your PC, unzip it and install it to your phone using the Desktop Manager; scroll down the page until you see the Scribble Theme and under it will be the .zip link:
Themes by Chris 83xx 4.5 - BlackBerry Forums at CrackBerry.com
also this one:
http://www.blacklightthemes.com/f25/...le-today-2354/
and these two from the same developer
http://blueroomsolution.com/showthread.php?t=1791
http://blueroomsolution.com/showthread.php?t=1426