My version of this is to shake fluffy wildflower seeds from my yard on windy days and hope they sprout in my neighbors’ yards. Spiny goldenweed, Desert willow, wire lettuce, and milkweed for example.
Honestly, the best thing we can do is talk to people. Show them pictures of flowers and pollinators and share why it’s important to grow native plants and provide habitat (as people were discussing in the linked “Fostering Nature” thread).