Not sure if this was common knowledge but if you put dirt/mycelium under item frame maps you could decorate a map with all kinds of stuff. : r/Minecraft
How I lost my 50mil Midas' to an item frame... | Hypixel - Minecraft Server and Maps
How to make an invisible Item Frame in Minecraft - Apex Hosting
Item Frames 1.15 vs 1.16 : r/Minecraft
MC-138377] Item frames / paintings break and duplicate when returning from a different dimension or reloading chunks - Jira
They finally added the ability to place item frames on the floor in Bedrock so I made a keyboard with a map : r/Minecraft
Signs Popping Up In Maps | Hypixel - Minecraft Server and Maps
minecraft java edition minecraft commands - How to remove item offset with an invisible item frame? - Arqade