I guess I am the only one that doesn't see Appaloosa in him. Yeah, he's funky, but I don't know if he's funky in an Appaloosa way. I think he's way more unique than that!
First glance he looks like a brindle. But then he reminds me of the strange pinto on this page too, because he almost looks like he has tobiano type markings. Brindle Icelandic Horses
Chimeric perhaps? He's really beautiful and unique! I can't believe he slipped by in an auction. I would have brought him home for sure, especially since he's saddle broke. And gaited too, what a cool horse!
PS. My guess on breed is Tennessee Walker or Missouri Fox Trotter.