Are there any examples of picture books that rhyme only in select portions of the text, rather than rhyming the entire time? For instance, every third line is a rhyming couplet, something like this (just a made up example):
Fuzzy the Bear went to the library.
He marveled at all the books he found inside.
Some books bound in red and blue,
books were bound in every hue.
...and then that structure repeats throughout the book. Is this something that's been done? Is it "acceptable"? Would it be a horrible mistake?