Default interface in copper/brown instead of silver/blue, please?

[GCT]

Hello all, and thank you to the mod developers on this site. I'm looking for something quite simple, just a basic recolor of the default UI.

Obviously I'd like the MoM UI, so I know I have to wait until at least next week.

And if this is a fairly simple task, could somone please explain where I can find the default UI in the game installation so I can mess around with it in Photoshop?