I have since made a smaller one that is more subdued and replaceble.
For me it makes finding our cabin easier and gives it more of a homely feel.
Some folks head to the dollar store and just get a sheet of tropical themed stickers that get tossed at the end of the cruise.
When we had a larger-than-average balcony on Miracle I went so far as to have a University of MD flag and a 6 ft tall inflatable palm tree on the balcony secured with magnets slapped on the bulkhead. It was a hit with folks on ships we were tied next to in port.