(i cant draw well enough to make visuals, if anyone else wants to then feel free!)
idk names for these but like

rain base: different layers of bluish grey(more blue than you're probably imagining), with cloudy patterns and maybe a few teardrop shaped white markings

water base: blue like a swimming pool, with white patterns on it that look like foam across the surface. white unders, white facial parts and such

lake base: greenish blue base, with darker parts, and some black markings(like under-eyes and paws) and black stripes perhaps