YgYg / Ygyg = Yule Log (l) - creates a pattern similar to wood grain on the basecoat of the curly, wood pattern will always be a few shades darker than the basecoat.
MlMl / Mlml = Mari Lwyd (uc) - a white marking that creates skull pattern on the face–will only ever be a horse skull–and turns the mane completely white.
KpKp / Kpkp = Krampus (uc) - a black marking that creates a thick dorsal stripe that extends down over the shoulder–completely covering the front legs–and follows the bottom of the barrel, in addition to a thick black blaze on the face. Homozygous dominant Krampus will also extend to the back legs and up the back of the thigh. Goes under white markings.
JkJk / Jkjk = Jólakötturinn (r) - creates a white cat-like pattern on the face, as well as vertical white claw slashes on the lower leg that also affects the coloration of the hooves.