Rounds in Battle Royale could be given levels of randomness for a more unique experience each round by adding a weather system. When starting a round players would be flown in and parachute down to their spots in either a nice sunny map as normal, or perhaps a bit overcast or foggy. Maybe it's raining.
Apart from being visually different for each round from an environmental experience point of view, the experience of combat would be changed too. Sniping through harder to see weather conditions or the sounds of footsteps and some combat being dampened by the surrounding rain could change how rounds are played a bit.
By adding a change like a dynamic weather system, BR can be given a new coat of paint without needing to make a whole new map.
This doesn't have to be kept to just BR; Death Match Royale (Dead End City) could also make use of it. My suggestion here has focused on the idea of sprucing up the BR mode.