Black n White photos layered with coloured geometric shapes creates a really clean, yet visually pleasing image. We could create quite a busy image or keep it quite simple like this and sit the logo on a coloured shape.
Stormwater filtration systems from the Philadelphia Water Department’s "Green City, Clean Waters" program. Click image for link to full profile and visit the slowottawa.ca boards >> https://www.pinterest.com/slowottawa/
Manchester campaign to stop people from littering. Playful approach with copy referencing famous song lyrics and film quotes, coupled with bold messages warning residents of fines and urging them to keep their city clean.