The Crayola blue glue sticks are a splendid little piece of soft innovation that really solves a user problem.
The glue is blue when active but dries clear.
So, when constructing your collage or picture (as my son demonstrates in this in progress Jurassic Park expression) it's easy to see which areas have glue coverage, thus avoiding the inconvenience of unstuck elements after the fact.
Identify a real user problem.
Iterate the product so that it doesn't require a new behaviour but simply makes the existing behaviour easier and gets the user to where they need to be, better.