we went to Lowes and picked out some cheap faux-wood trim. Faux wood was definitely the way to go for this because not only was it WAY cheaper ($6 per 6ft piece), but the synthetic wood was also really lightweight and much easier to hang. After we glued the frame to the mirror, I caulked the gaps and painted the entire frame white.
These looping GIFs created by Swedish artist Erik Soderberg are pretty dangerous. I started watching them because they're really cool, and I ended up completely paralyzed, trapped inside those geometric patterns.