theme help

[DJLucky0ne]

I was hoping someone could lend a hand; I am trying to use the royale theme with a different desktop and have it show up as the default theme on boot and when a new user is added...I have tried every combination that I can think of.  I have been inserting the signed MS theme package and wondered if there is a way to edit it so the "energyBliss" background could be changed?  any help would be appreciated.  Thanks!