Minion with Freeze-ray warning
My son designed our project and with the help from his younger siblings (and Mom to oversee and make suggestions) completed it. The slogan is "Stop. No Litter. Don't make us freeze you" . The minion is holding a freeze-ray gun in one hand and the warning sign in the other.
Thank you for this opportunity. My kids are very aware of how people litter at their favorite parks and natural areas - often they clean up after others to keep the place looking nice.