Winter VS. Summer colors

What color differences are your horses in summer and winter? I have no pictures but my mare is light chestnut in winter, and a very dark liver in summer :\ I would love to see pictures. Another mare we have is grey roan/fewspot, and when she has her winter coat, you can hardly see her spots. Our bay gelding looks cherry bay in winter, but almost buckskin in summer (he even has a very faint stripe!)