Revolving Profile Pictures

Not sure if this has been posted somewhere already but I couldn't find it so apologies if it has. I think an interesting feature could be a slideshow-esque revolving profile picture log. So basically you select a few of your profile pictures and can select them to change every day or 6 hours or so in a slideshow fashion. I have a few indecisive friends who change their profile pictures every few days and this would be perfect for them. Thank you!