This addon will enables the tag <IMAGE_RANDOM> which is the ID of a random image of your Pixelpost photoblog. Using this ID, you can link to a random image easily. Usage: <a href='index.php?showimage=<IMAGE_RANDOM>' > Random photo </a>
The above tag links to your photoblog with a random photo.
Update: this tag is now availabe on all page of pixelpost photoblog.