Stop in for a cup of coffee

I put an idea out years ago. Suggested a mural kit. Several overlays to create a given image.
His flames were really good,figured he could market something like that.

What im getting at, is say coloring book had wheel choice templates. Or scoops. Spoilers..
That might work in an online image selection program, but very hard to do in a coloring book. There would need to be far more pages of templates than images and every image would require a full set of supporting templates. Might not be a bad idea for a stand alone software program for printing “custom” images to color.