How to randomize featured images on homepage

Hello!

I’m looking for a way to randomize all the featured images on my homepage.

http://www.andrewmckinley.com

Anyone know a magic piece of code which could achieve this?

I have hundreds of photos / featured images on infinite scroll on my homepage and would love a way to give some different faces a turn at the top of the pile.

Many thanks.

http://wordpress.org/plugins/automatic-featured-image-posts/