Lifestyle Crafts (Quickutz) sells a pack of self-adhesive cork for use with their dies. The pack comes with two different types of cork - a tight, smooth sheet and then one that looks like this and has larger, chippy pieces of cork.
For this background, you'll need two sheets and you'll want to cut them down 6" wide by 4" tall.
Then stack the two pieces on top of each other.
Once you've created the corkboard, you'll want to cut strips to create the "moulding" around it. In this case, I used some old school Making Memories metal moulding strips that I painted. You could cut chipboard and emboss it with one of the Lifestyle Crafts border embossing folders instead.
Once your moulding strips are ready, cut the corners at an angle to match up picture frame style and glue them down around the edges.
Voila! Instant corkboard!
Try it on a page and leave a comment with a link to your creation.
...Oh, and if you need some fun "pins" for your pinboard, Recollections makes a set of chrome colored flat pearls that work wonderfully!