I just recently added a mirror to our outdoor dining space. I love how the mirror reflects the lush greenery from our backyard onto the boring gray house siding. There was a little corner of the deck that I added a cart to, but once I added it, I really felt like it still needed something. An outdoor mirror was perfect for the space. It makes the wall feel bigger and I like how it brings inside-living outside.
Here are some lovely inspiration pictures.