Spider skins

I though it could be interesting for spiders to have additional skins, as the black design we've come to know and love so much could make use of some variety. Having brown and grey skins could spice up variety. Without necessary impacting gameplay in any meaningfull ways. Prehaps theses skins could be biome based ? The brown one for forests, the gray one underground and the regular one for everywhere else ? As for the cave spiders, I wouldn't change them as to keep them recognizable from regular spiders but prehaps a subtile model differences could make for interesting and simply visual clue that theses aren't your regular spider.