In an effort to raise environmental awareness in children, artist Lily Franky and Sesame Street collaborated to create garbage bags printed with an image of the trash-lovin' Oscar the Grouch.
Pink Tentacle has more artful garbage bags (including a very clever rabbit-kun plastic trash bag by Tokyo-based creative group MAQ, Inc.): Link
Let's solve one problem at a time. It's a nice start if you can get people to stop leaving their trash at the park.