footprints would be cool and add a twist to hunting in winter and more muddy environments, you could track down animals and even players (and maybe animals could track you down)
animals would all have footprints respective to their paws,
different boots would have different footprints too, like nakeds having just bare footprints, fur/leather boots having boot footprints, then armors could have different unique footprints, bunny slippers could have bunny footprints