I executed this idea, you can view the end result here!
On the 21th of September the Netherlands celebrate 'KeepItCleanDay!'. All illegal litter will be removed from the streets, the parks, rivers, forest and public traffic system. It's a grass root initiative and we work without money! So... Why don't you empower the whole Rotterdam to join the KeepItCleanDay! www.keepitcleanday.nl An idea from Annette