Meandering books with cut outs

Meandering books are so easy to make!  Then typically use one sheet of paper folded and cut so that they meander when open. 
I saw a post on Pinterest where an artist had cut many holes in a variety of shapes like windows on each page and painted the paper so that the meandering book has some more interest. 
These two examples are my take on the idea of peek a boo cut outs.

The first one is made from an 8 1/2 sheet of white cardstock that is painted.  The second one is larger and made from a kraft grocery bag.