9gaurav

A cool , simple sidebar widget for Google Plus profile badge. 
Displays your Google+ profile pic, short information and link to your Google+ profile.

Google+ Badge

A Google+ Badge displays your profile information for your blog or site.

benjick

Add a Google+ Page button easily with this plugin. The shortcode is <code>[googlepage]</code>
Usage: 
* Smallest icon: <code>[googlepage page=YOUR_PAGE_ID]</code> 
* Medium icon: <code>[googlepage size=32 page=YOUR_PAGE_ID]</code> 
* Biggest icon: <code>[googlepage size=64 page=YOUR_PAGE_ID]</code>
In page=x where x is your Google+ Page number.

Google Plus Page shortcode

This plugin allows you to add links to a Google+ Page with simple shortcode

Google+ Badge vs Google Plus Page shortcode