Coula been, also coulda been The last unicorn. Oh if ya havn't read the book, don't bother bacuse it's almost parr for parr with the animated movie, but then again i coulda've seen it in some "Unicorn Facts" books or somethin. But I like the colors you worked with anyways, It's just an idea is all.
I read the book when I was 15. Didn't even know the movie existed until years later and to be honest, I think it's terrible. The animation is awful, the music is cheesy and yeah, it doesn't do the book justice at all.
The thing about the gold foals, silver younglings and white adults IS from Harry Potter. They also have silver blood in the books. It's cute, but if you want unicorn "facts" (like there's any such thing) read The Lore of the Unicorn.