This is what two of them look like from outside:

https://www.flickr.com/photos/schuminweb/51676075599/

https://www.flickr.com/photos/schuminweb/51676075174/

I can't imagine that they're all that exciting looking on the inside. After all, they're not designed for humans as much as they are designed for computer hardware. I had to go to the Atlantech data center in Silver Spring a long time ago, and it was pretty much gray and white corridors with cages for computer equipment in it.