You want to save your avatar photos taken using Adium X.
Adium X, an instant messaging client for OS X that connects to multiple services (e.g. Google Talk, AIM, Yahoo, Groupwise Messenger, etc), includes the ability to take photos using your iSight camera to use as your avatar image. To add a custom avatar choose Adium > Preferences > Personal > Chose Icon. The Image Picker will load up, and you can shoot your photo by pressing the camera button.
Browse to Macintosh HD > Your User Folder > Library > Images > iChat Recent Pictures. There you will find all of the photos you have taken using Adium X.