grab some crayons and sharpen them over wax paper
cover with another sheet of wax paper. carefully place them between larger pieces of paper to catch the wax in case it oozes out the edges.
carefully iron the paper. if you run the iron along the paper you will smear the colors together. if you lightly press up and down you'll melt the colors but they will stay mostly individualized.
cut out heart shapes once the wax paper has cooled.
punch a hole in the tops and string them on some yarn. we hung our largest one in the middle - then on either side we strung our hearts from largest to smallest.
easy peasy and beautiful!
