Are you familiar with the Taro Gomi coloring books?
There's a series of them. This one, Doodles, is Pearl's first. Each page spread has an unfinished picture and the sentence at the top contains a suggestion of how the child might complete it. For example, the picture (below) asks that you give the girl a fabulous dress. The second one asks you to fill in the boy's talk bubble with the saddest possible sentiment. (Pearl has written, "I lost my puppy.") The third picture asks that you fill the tree with birds. I would have LOVED this kind of book when I was a kid.