There are different methods to specify which pictures to use:
Choose a category from which to randomly select picons.
(Advanced) Provide your own Picons
Search user and host patterns and database choices.
(Advanced) List web images by URL and/or picons by path, one
per line; e.g. users/edu/indiana/kinzler/face.gif.
Even if this method isn't selected, any pictures listed will be used.