Themes for backend?

[Schop]

Question: Is there a plan to make the PivotX backend 'themable'? Of course it's not really a functional feature, other than just fun to play with maybe, but I was just wondering how hard it would be to build that in...

It's not hard to change the look of the backend, but if it were possible to choose a backend theme somewhere in the backend itself, that would be nice...