morettolss

Add a Google+ (Plus) badge whene hover the user name, like plus.google.com. 
Check out an example here http://www.alessiomoretto.com/google-badge-per-gli-utenti-plugin-wordpress/
Usage: use a shortcode like: [gplusnamelink id=”ID” name=”WORD”]
Where id is the ID of the user (go to user profile and get the number) and word the text linked.
<h3>Donations</h3>
with PayPal on morettolss@gmail.com

Google+ Link Name

Add a Google+ (Plus) badge whene hover the user name, like plus.google.com.

Mervin Praison

This plugin helps you add Google authorship markup to your WordPress site, allowing your Google Plus profile picture to appear in Google Search results.
Features: 
* Easy 4-step setup process 
* Multiple author support 
* Multisite compatible 
* Shortcode support

WP Google Authorship

Nice

Google Plus Profile Picture appear in Google Search. Very Easy to implement. Including Google authorship for multiple authors and multisite.

Google+ Link Name vs WP Google Authorship