No matter what I use, e.g. gtk-ctheme, and the other apps availible in the repos, gtk applications running under Awesome WM stay ugly.
The same apps look fine when I use unity.
You can edit the gtk config files, like described here http://awesome.naquadah.org/wiki/Customizing_GTK_Apps
lxappearance works fine too, but if you can't get it done with gtk-ctheme then it probably doesn't work for you either