Google+ is only out in beta and already the talk of the internet world. If you’re one of the select few to have a profile set up, why not link it on your website the attractive way- with sleek icons!
Available are a set of free Google Plus icons. The icon comes in 4 sizes (64px, 32px, 24px, and 16px) using the PNG format.
Download from our resource center
These icons are licensed under GPL v3. Find full license details here.
Very nice icons, I dig the simple but professional design.
I also use a similar but slightly more stylized version (Glossy+):
http://www.scriptalicious.com/blog/2011/08/glossy-free-google-plus-one-icons-set/