Realistic Primitive Horse Breeds is a model and texture replacer for Skyrim's horses by KrittaKitty. The new textures and meshes keep Skyrim's pony-like look for the horses, while being far more high quality.
The version tested is 1.1, though a version 2.0 has been released after a slight mix-up with the folder structure caused invisible horses. This has been fixed.
The mod is incompatible with any other mods that alter the horse textures or meshes.