I made these from a build your own bendy straw kit I bought on Amazon. The sewage containers are recycled packages from some snacks the kids had. I just spray painted it all black then hit it with the dry brush to make it look metallic. I sprayed sepia wash on at the end to tint it slightly – looks better in person than on these pictures. The sewage is dried gorilla glue sprayed with some green paint and green wash.