Ubuntu 11.04 users who have opted for GNOME 3 over Unity as their desktop environment can benefit from a truly integrated Ambiance theme, thanks to DeviantArtist thedeviantmars.
The GTK3+ port of the default Ubuntu ambiance theme, which he has dubbed ‘Adwance’, is a faithful adaptation albeit with a few minor differences – such as window controls being on the right hand side.
Tweaking the default theme in GNOME 3 can be a bit of a hassle so make sure that you have gnome-tweak-tool installed to enable easy selection.