Facebook just announced a new tag today, the fb:random tag. From their website:
“Fb:random allows the developer to input a series of tags, of which 1 or more will be shown randomly. Each item can have a weight and the tag can be specified to show more than one of the choices. Each option should be wrapped in an fb:random-option tag.”
You also have the option to assign a weight to any of the tags. So it looks like you now have the option to, with pure fbml, to include random items in your profile. Expect to see many more non-Flash 8-balls, dice, and random quotes in the near future on your friends’ profiles.