This one was purchased from Home Goods (I added the nailhead trim), however there are lots of great tutorials on the web for making your own, especially if you need an oversized board. Homasote is a great product to use and you can wrap it in the fabric of your choice and add wood framing around the edges to up the ante. Search the web then hit your local Home Depot or Lowe's building department for supplies. Good luck!

I just found a couple really cute boards at Kirklands, similar to a Home Goods.