What a fun theme! Here's my Amateur entry. Upcycling is a great way that contributes to sustainability. It also boasts some benefits comparing to recycling. In this DIY home studio in the old district in Havana, seemingly useless stuff like old newspapers and wires were upcycled into cool figures:
If you are interested to see more creative upcycled objects I found in different places, feel free to check out my old post. :)