I recently saw a micrograph of beach sand and I was astounded by it. It was a beach near a coral reef, and the sand was not tiny rocks but tiny bits of coral. The tiny bits were beautiful and I did my best to redraw them here. Search Spoonflower for 'coralsand' to see variants and other colors of this design. Search for 'kmicroscope' to see my whole microscope-slides-inspired collection. Search for 'greyscale' to see more black/white/grey designs. Want this resized or recolored? Just ask!