[NTLDR]

Two variations, based on if you want random smilies in each group or random smilies from any group respectivly:

In includes/functions_editor.php find:

PHP Code:

                LEFT JOIN " . TABLE_PREFIX . "imagecategory AS imagecategory USING(imagecategoryid)
                ORDER BY imagecategory.displayorder, smilie.displayorder 


Replace with (for random smilies within each group):

PHP Code:

                LEFT JOIN " . TABLE_PREFIX . "imagecategory AS imagecategory USING(imagecategoryid)
                ORDER BY imagecategory.displayorder, RAND() 


Or replace with (for random smilies from any group):

PHP Code:

                LEFT JOIN " . TABLE_PREFIX . "imagecategory AS imagecategory USING(imagecategoryid)
                ORDER BY RAND() 


Untested but should work.