1) Pango-patched openbox
I just applied a pango patch for my favorite WM openbox. By using pango, openbox can use different fonts to display different encodings in the same time (as in gtk-2).
2) Indubstrial theme -- the refined industrial
Indubstrial for gtk Indubstrial for openbox
3) The Kazehakase web browser.
It's a lightweighted gtk2 browser based on mozilla/gecko. Pretty slick. And the UI looks much refined. You can find a lot of functions of firefox plugins just come as builtins in kaze (notably, mouse gesture).