After checking all those 4 themes, I think, I like most Killing Floor theme and while, however it's red is too bright and hurts my eyes a bit. I'm talking of red of "staff member" and menu (I mentioned those elements because, buttons have different red color). I think if admin would choose a bit darker red, like this for example: #8B0000 would be better in my opinion. But in general, I'm enjoying this theme most.