This is an interesting piece my mother did, she took a class from Barbara Leduc, Teacher RHGNS at Joyce LeMoine's home here locally.
I had never heard about Monochromatic Designs till this point, to me personally the idea sounded a bit intimidating as I'm not a highly skilled hooker myself.
Mom decided to use all the multiple shades of green for Santa and his bag of toys and 3 toned natural , white and celery colors for the snowy background. Using the different shades in the background other than green is not an exactly a true monochromatic but I think this projects a nice effect.