My client provided the material. It was from one of the big box stores: Home Depot or Lowes. Just search their sites for peel and stick steel tiles.

http://www.homedepot.com/p/Unbranded-Long-Grain-3-in-x-6-in-Metal-Decorative-Tile-Backsplash-in-Brushed-Stainless-8-Pack-A52-50/204208646