Hi, I think I'm in the right place .. I have written a widget to display random images in a sidebar and I thought I would make it available to all in case others might find it useful. The main point of it was to be able to link the individual images to a gallery somewhere (other than flickr for which there are loads of widgets).
Anyhow, you can grab it from http://www.aloadofstuff.co.uk/wordpress-widgets/alos-random-images
If you do try it please let me know what you think either on this thread or my website contacts form.