I love Holstein Heads on a red background.  Something about red, black and white that works so well to me.  I don't have a lot, although the really large paintings I've done of Holsteins were 6'x7' and had red as a background, they were stunning.  I might do something like this larger, but for now here is a 5x7 daily painting, Holstein Heads.

5x7  "Holstein Heads"  #20/31    $99