Mock up off-line ?

[Maalpractis]

I was just wondering, is it possible to arrange the pieces of a UI without being logged in to the game ? What I mean by this is, is there a program or something that allows moving the pieces of a UI around so that you can try different arrangements ? Once you have a set up you like could save the WTF information and plug it in so when you log on, the UI is already set up and rdy to go.