Also on these boards
paint a piece of wood (could paint a solid color, or paint a design/pattern like this one), sand and distress/age the corners, then attach a regular picture frame on top. These are about $150 in gift/home decor stores.
After removing the mirror, I painted the frame a bright yellow. Then I stapled chicken wire to the back side of the frame. When I bought the chicken wire from Atwoods the man working that department asked if I needed any pointers for my chicken coop. I told him I was making a frame for artwork. He shook his head and walked away.