The Chrome OS team is adding eight more animated profile icons. The team had recently updated the default profile icons with animated pictures. This is a new set of abstract images, according to this code change request.
Now, here are the images:
It might take a while before these show up on the Canary and Dev channels of Chrome OS. Do not forget to check the profile icons section of the Settings up when you get the next update, if you are on any of those versions.