Well with a little bit of haxing I have made a simple, easy to use random image script. Take a look at my avatar and refresh the page for an example (only two images there however).
I have enabled .cgi extensions on the forum so you everyone can use it if you wish. If you want to use the script on your own server (Requires Perl 5), you may download it here.
I can also host the script for you on the semicolon-zero.com server. I have to do this myself however, because all scripts must be run within the cgi-bin directory (will not work in any of the hosting directories).
If you would like me to host the script for you, just provide me with two things:
1) The image directory where the images you will be using are located. I suggest making a new directory for this if possible.
2) The list of file names (example: sig1.jpg, sig2.jpg, etc). Try and use numbers, this makes things easier for everyone. It's probably a good idea to make multiples of the same images (example: you have image 1, 2, 3, 4 but 1 and 2 are the same, and 3 and 4 are the same) this way if you want to add additional images in the future you can easily do so without having someone (me) update the script for you.
:wiggle: