Google+ gains more popular day by day, many sites add +1 icon on their sites to let visitors share their posts on Google plus social network. Here you can download free Google Plus icons in vector format, PNG or PSD format to put it on your sites. If you want to create it by yourself, there a Photoshop tutorial on how to create a Google+ icons too.
Google Plus Icon 1
Google Plus Icon 2
Free Resource + Tutorial how to create G+ icon with Photoshop
