not sure if youre into mods but https://valheim.thunderstore.io/package/ComfyMods/ColorfulPieces/ allows you to color the chests but i recommend you install a config manager so you can change the colors if not you will have too use the config editor built into thunderstore here is the link for thunderstore as well in case you are interested https://www.overwolf.com/app/Thunderstore-Thunderstore_Mod_Manager