I attended the GGJ this year with a programmer and techincal designer. We decided to pick 4 diversifiers including one that forced us to make the game in black and white. Within the game you search for trash underwater to build your house on top of the ocean.
I was the only artist on this project and was responsible for all visuals, except the ocean itself.
The game can be found here: https://globalgamejam.org/2019/games/trash-splash