OK, So I Saw This In An Email From Google And Thought It Was Cool

So Google Sends Out an Email Today To Local Guides Showcasing Several Guides At The Different Assigned Levels Google Has Put Them In. On The email in the center there is a collage of pictures then in a few seconds it changes all the pictures to different pictures and each set of pics corresponds to the level Google has assigned the people in the pic. My Question is How Easy or Hard Would it be to duplicate this. I can think of so many uses. I can send a copy of the email as posting my “Read Only Link” Would be irrelevant.
Thank you very much