I've been experimenting with photos in very small formats and small details from photos.
Pinhead
(http://www.funkelwerk.de/data/miniatures/pinhead.png) (http://www.funkelwerk.de/forum/index.php?topic=241.msg736#msg736)
There are some more ... (http://www.funkelwerk.de/forum/index.php?topic=241.msg715#msg715)