You can see these types of plant stands being sold by West Elm, but honestly this thrift store loving girl is not going to be paying those kind of prices for something so easy to DIY.
To make the "ledge" the planter will set on, measure the diameter of your pot and add one inch. This is the length you will be cutting your 1 x 2 x 6 ft board into. You need two of these pieces cut.
I stained my plant stand using an English Chestnut colored Penetrating Stain. You just put it on with a brush or clean rag, wait 5-15 minutes and wipe off the excess.