Love this idea! Wrap fabric around cardboard and place into shelf instead of painting inside. You can change out as much as you want to.. Good tip if you don't want to paint or if you want to change the look of the shelves with seasons..
GET THE LOOK @ IKEA // Get a slew of the mid-sized LACK wall shelves in white and create your own composition of shelfs to suit all your books and chachkies. Put a twist on this look by going high gloss.