Switzerland isn't known for its excessive litter but the authorities in Lucerne have felt the need to start a campain to reduce the amount of litter. they seem to be going about it in a novel way.
Would this make you not drop litter? Would you use any of the novel methods?
Brilliant! The hopscotch one is especially inviting. This plan will definitely draw attention to the cause, and may possibly compel some people to pick up litter which is not their own in order to throw it away! Now THAT would be a successful litter plan.