Take a look at this video, here I show an awesome new technology for using Clutter/Gtk with Cascading Style Sheets.
You can test this out for yourself with Ubuntu 12.04 (Beta) using the following:
sudo apt-get install gir1.2-gtk-3.0 gir1.2-clutter-1.0 gir1.2-gtkclutter-1.0 gir1.2-gconf-2.0
bzr branch lp:csslavie
Note: default clutter/cogl has a bug which prevents the background’s opacity setting, so you won’t get as cool an effect. But a fixed version of those libraries should be available eventually.
Please comment below what you think.