The official website at http://razor-qt.org/ describes Razor-qt like this:
Razor-qt is an advanced, easy-to-use, and fast desktop environment based on Qt technologies. It has been tailored for users who value simplicity, speed, and an intuitive interface. Unlike most desktop environments, Razor-qt also works fine with weak machines.
After using it for sometime, I think I really like it. Fast, responsive on my weak machine, and easily configurable. I enabled zoncolor GTK theme on Razor-qt desktop session. Then I browse the default Razor-qt themes available (there's four pre-installed ones in latest release 0.5.2), which are beautiful. And then I quickly think to create a new one, to match the zoncolor theme to make them look integrated.
Based on the default theme, here is the zoncolor Razor-qt theme.