I've been looking really hard at penny tile lately, for the flooring in a client's bathroom renovation. And in the specifications for all of the manufacturers I've come across, it is stated that the tile can be used indoors and out. While I've seen it used quite a bit indoors, I've never once seen it outdoors. So, I went searching for examples of people using penny tile outside and found almost nothing:
But there were two little glimpses of what the material could be like outdoors at Lushome, in their roundup of actual pennies as tiles. I think it could be a gorgeous outdoor material, with all of the tile's small, scale-like facets to catch the light.
Have you ever seen penny round tile used outdoors? How did you like it?