Make colored sand art by stirring a chalk stick in a bowl of salt. it changes the color. Stir less for light color and more for dark richer color. (I used to do this with salt and food coloring. but the chalk stick idea is brilliant!
white base nail + three neon colors on an acetate/plastic sheet + makeup sponge + nail polish remover around the cuticles = gradient nails! (site is in french, this is the summation in english) summer nails!