The Devs specifically said that the UI would be able to be completely redone/reskinned/etc by anyone willing to do that.
I wish I could remember where I heard/saw it. It was HTML and something, Javascript maybe?
I’ll keep trying to find it if @Geoffers747 doesn’t beat me to it! 
Aha!
@sdee : Also, Javascript/HTML for the UI.
(sdee is one of the Devs by the way.)