I say make one!! It would be fun to do, and you'll have what you want on it!! 

I got ours at Wal-Mart and it's actually really neat

mushybooks. http://www.mushybooks.ca I love them. I have one for my first baby and plan to buy a second for my next one. I love the styles and clean design.

I looked on Amazon and Ebay there were a bunch of cute ones.

I just found a super cute one st Barnes and noble 

They have a ton of them at BabiesRUs