Isn’t it amazing how myth and mythology take hold and never go away? That's a real popular myth on this forum.
There is no genetic link between ear lobe color and egg shell color, white, brown, blue, or green. A lot of chicken breeds do follow that which is probably where the myth started, but you can look through Henderson’s Breed Chart and find several examples where this is just not true with purebred hens, not just the Hollands. When you start crossbreeding and dealing with mutts, it’s not even close to true.
Henderson’s Breed Chart
http://www.ithaca.edu/staff/jhenderson/chooks/chooks.html