Just dip the cutting edge of a cookie cutter (we used snowflakes and scalloped circles) into white heavy body acrylic paint (sold at art stores in 4-oz. tubs).
Stamp the cookie cutter onto a sheet of colorful paper, starting at a top corner. Create your own patterns by either joining or overlapping the shapes.
If the paint is too thick or lumpy, add a few drops of water and stir gently until thinned and smooth.