I'm a fan of some of the illegal arts. I get, grudgingly, that gorgeous, bright colors of spray paint and mop markers are toxic. That's what makes moss graffiti, botanigrams, clean tagging (literally erasing grime), and other, newer forms of graffiti interesting.
As if beets aren't delightful enough, their gorgeous color calls out for brine reuse. And there are uses. If you're not drinking it as a tonic, or dyeing paper, clothes, or food with it, consider beet tagging.
Note that it does take some practice to get both your method and message right. Consider this grossness:
While you're practicing, why not be digesting this lovely Mediterranean Beet and Yogurt Salad? Here's how to make soy yogurt so that you can get the tang without the dairy.