Most of the playground is straight from Pandamaru's stuff for VX Ace. -- https://pandamaru.de/index.php/downloads/rpg-maker-vx-ace/rpg-maker-vx-ace-tiles...
The swing, however, is something I made (following a similar design Nicnubill had) because I needed everything to be allowed for commercial use if the cutscene was to be allowed for the 'Let's Make a Scene' contest on the RM forums. I plan to release it for everyone's use soon.