Eevee's unique evolution methods depend on stones ... Nimbeon is blue, with a cloud-like tail, resembling a small pony, while Wispeon is gray, featuring a pink, fluffy mane similar to a lion ...
Eevee currently has eight different Pokemon it ... the Flying-types have a cloud-like look with one sky blue and the other a pale yellow, and the Ghost-types are black, white, and blue or black ...