Wow! I’m new to NCL and had no idea for decorations are prohibited. Granted, I’ve seen people go way overboard with junk spilling over on to walls/hallway, taped stuff. I can see how that could damage surfaces. Be a hassle, etc. I typically do small, custom magnets in the theme of our cruise ports. It’s always a fun craft to work on as I countdown to a cruise! Fun for the kids and of course helps identify the cabin easily. I suppose I’ll just pick up a few small magnets, and will take them down if asked.