outline your checkbook onto fabric and cut inside the line
add a layer of your mod podge on the checkbook and then apply the fabric and smooth out
and trim any excess after it's dry and then add a final layer to seal.
I know checkbook are practically obsolete but we do still have to use them sometimes. I do most of my bills online but sometimes you still have to pay with a check, so why not schnazzie that sucker up. Dust it off and give it a new look.