I decided to play with Carbide.UI a little and using an existing theme as a template everything seems straight-forward enough.
One thing I could not understand, though, is if, and how, it is possible to edit the "Go To" screen (the one with the 3x3 grid of shortcuts).
Any hints are welcomed.
* EDIT *
OK, I think I got the hang of it, managed to change the appearance of the header.