Here is the best thing I have found to put random pics on your site! Easy as making a folder, putting some pics in it, put that folder in your nuke images folder, and putting a file in your blocks directory!!
Download from me [
HERE!]
Get some images you like (thumbs work best), and place them in a directory called "random" inside the existing php-Nuke images directory. Put the file block-RandomPic.php in your blocks directory. Then activate the block.
I just used the thumbs from my gallery, copied them to my new random directory.
This block, will fetch a random image from that folder, and put it on your page, can be anything you want.
Credit for the block goes to:
http://www.lvoncall.com You can also download the block from that site.