I found the railing mount planters at Home Depot. They are designed to hold a plastic flower box, so I had to modify them to hold the moss. Using thin copper wire, I created a grid small enough to contain the moss and dirt. Then followed the same steps as when I plant my hanging baskets. (tutorial here)
I used purple New Guinea Impatiens, blue Lobelia (upright), Coleus, and Sweet potato vine.
I think it gives a nice pop of color to the front of the house. :-)