These tend towards GNOME. As an Xfce user, I would move back to GNOME if GNOME allowed for on-the-fly swapping the camouflages.
OSX/Aqua
* http://www.linuxandubuntu.com/installing-themes-in-linux.html
* http://www.linuxandubuntu.com/linux-themes/make-linux-look-like-osx-with-osx-arc-collection
Windows Camouflage from Tails
* https://tails.boum.org/news/version_2.0/index.en.html
* https://labs.riseup.net/code/issues/10830
* https://tails.boum.org/news/windows_camouflage_jessie/index.en.html
These tend towards GNOME. As an Xfce user, I would move back to GNOME if GNOME allowed for on-the-fly swapping the camouflages.
OSX/Aqua
Windows Camouflage from Tails