I make eggs like that all the time, especially this time of year when....
beets are available at the Farmer's Market along with lovely beet greens. I love beet greens. Never thought of making deviled eggs out of them. Usually, I put the whole, peeled egg into a container with cooked sliced beets, s & P, a little garlic powder, Saffola oil (it does not coagulate in the fridge) and apple cider vinegar, a fresh herb or two and we use it as a side dish with lunches. The purple whites against the yellow yolk are beautiful and tasty.