This is an adorable idea and very well realized. It always annoyed me that some crayons were used up and grew smaller then others. The idea that the various colors are fed up with being overused, underused, used incorrectly, etc. is one I wish I could have read when I was young.
The letters are quite funny, each written in the complaining crayon and give great examples of why their issues deserve attention. Coupled with their missives are pictures that look exactly as if a young child has scribbled them. They also illustrate the example mentioned in the letters, such as Red's with Santa Claus, fire engine, and Valentines' hearts. Or Purple's lovely dragon.
A cute but kind of sad part was poor Blue's letter and picture with the crayon so "stubby" he's barely there!
A quick read that can take longer then you think to take in the illustrations, the book ends with a brilliantly child-like solution.
I thoroughly enjoyed reading this and have no doubt I'll have to break down and buy a copy.