I like to make at least one for kids to color with each new book I do. For NO MUSH TODAY, I've got several ideas.
Lately, I like to print a drawing in blue - by cutting the black channel and pasting it into the Cyan. Then I ink right on top of it, then scan it in and delete the Cyan channel.
What's hard is making the art simple enough to be colored in! It's hard to tell what will be "too hard" for kids or "too easy". So I make both. I guess it also depends on the age of the kids, and how much patience they have.