Cork is notorious for splintering. Years ago they made bulletin boards out of it, but it didn't do very well. You can buy foam insulation board and cut it to the width you desire, cover it with the finish - fabric or other material of your choice- to match, blend or contrast with your walls. Pins stay in it beautifully. It does not splinter, crack or become damaged from usage. You will be limited only by your imagination as to the size you use and to the way it looks on your wall. It is very economical and easy to trim to shape and to slipcover.