,Spawning snow or changing tilesets to snow as the player walks past them

How would i go about my project? Im currently trying to make a 2D pixel art platformer game where wherever the player walks he will spawn snow on it or change the existing tilesets to a snow themed tileset. I also made some pixel art animations of ice forming from the ground up to full blown icicles w$$anonymous$$ch will be included in the snow that will spawn when the player walks over a tile, but im still puzzled how ill implement them, I tried instantiating whenever the player triggers the collider but i cant seem to make it work properly, please help im quite new to Unity.