I made this orchid box for our bathroom window, based on a project I saw in the really cool book Cultivating Life. The wood I found on a Columbia River beach. I drilled holes in each end and then assembled the "log cabin" by running wire through the holes. I glued 4 slats across the bottom with JB Weld (best adhesive ever!), hot glue or super glue would work too I'm sure. Moss was picked up off the ground in a nearby forest. Twine and wire came from the hardware store.
This planting supposedly resembles an orchid's natural environment, as a parasite up in the treetops. The roots need lots of air circulation to not rot, and I think pots can encourage that. Planted this way, the roots will grow outwards, eventually feeding off of the box itself. This window is in our shower. The extra humidity I'm sure will be good for them too.
I like hanging house plants in windows. It frees up counterspace, and the plants get more light- especially important for the sunless winters here in the NW. I love this DIY post on Design Sponge about a window hanger made from leather.