I always have a problem with the new UI it always messes up and I cannot shift+tab into friends....i just use default now but thinking about going to new UI again.
I don't enjoy the new beta because it was not allowing mento connect to any counter strike server. Shadows told me to revert to the old one and sure enough BOOM! My CS:S is working properly again.
STEAM Beta = Awesome Its nice, but if you want others, go to FPS Banana and search for STEAM Skins. There are many such as MW2 skins, L4D skins, DoD Skins, maybe CSS Skins.
Diamond
Those skins sometimes work and sometimes don't in my experience. I think the dark and light green get horribly boring though. The black and grey is cool.