TL;DR - put your CentOS photos on https://www.flickr.com/groups/4570800@N22/

At events I use the CentOS Flickr group - https://www.flickr.com/groups/4570800@N22/ - as content for the booth monitor, along with Tweets mentioning CentOS to fill space between demos or videos.

If you have CentOS photos, please consider adding them to the Flickr group. Flickr accounts are free, and it should just take a couple minutes to sign up

Thanks!