You can override the user profile image file path loaded via user->iconURL()

~~~
<?php
function my_component_init(){
ossn_add_hook('profile', 'load:picture', 'my_component_hook');
}
function my_component_hook($hook, $type, $path, $vars){
//$vars['user'] contains user instance (OssnUser)
//$vars['size'] (small, larger, large, etc)
return 'your new path';
}
ossn_register_callback('ossn', 'init', 'my_component_init');
~~~