Why was this plugin revived? It seems reasonable that a member who hasn’t added their own avatar can be represented by mystery man. However, it seems ridiculous that a group without a custom avatar also be represented by the same single mystery man. Find out more about this BudyPress plugin at http://wordpress.org/extend/plugins/buddypress-default-group-avatar/
Next version to include an image as the default group avatar, making it even easier.