Dying Light is an absolutely incredible game, but all the kids are shifty little fuckers. I just agreed to go get some crayons for this ungrateful little bastard and his mates, and
Fabric paint crayons.
Dying Light | Game UI Database
Crayons for the Kids | Dying Light Wiki | Fandom
Dying Light: Crayons for the Kids Side Quest - YouTube
So the reward for doing crayons for kids is $1000, and these cute drawings :) : r/dyinglight