I couldn't find a garbage dumpster suitable for a top-down game under CC0 while browsing the site, so I made it myself. It's pretty janky, but it serves well enough if you don't look at it too hard.

It incorporates a texture from "Free Urban Textures: Roof, Tiles" by Scouser for the lid.

https://opengameart.org/content/free-urban-textures-roof-tiles

It's also CC0, but I wanted to acknowledge the contribution anyway. Please take, use, and/or modify to your heart's content.