I'm currently using Compiz 0.8 to get blur effects and transparency, in place of xfwm4. I had been using Emerald to provide window borders, but I was unhappy with the selection available there. I would prefer to use my GTK theme window borders (the ones I get when I run
xfwm4 --replace in the terminal).
It turns out you can pass the command
gtk-window-decorator --replace to use the standard GTK window borders. However, these use some sort of default theme that looks really out of place. I have no idea how to change it.
I'm running Arch Linux with XFCE. The Arch Linux wiki provided me with the same answer that a lot of other pages did - to use gsettings to change some entries. This didn't work, probably because (as the wiki page says, albeit without any elaboration) that Compiz-reloaded, the project that represents the continued maintenance of the Compiz 0.8 project, have switched to using Marco instead of Metacity.
So that leaves me at a loss. The change was rather recent, and Compiz is pretty far past its prime, so I can't find much on how to deal with this issue with the recent changes.