Crayola Fun Effects Twistable Crayons are a fun twist on everyday coloring activities. Each crayon offers either a bright burst of color, a mixture of colors, or both! Add new depth to your creations, with this truly unique Crayola coloring set. Build up your color collection with shimmering metallic crayons, brilliant neon crayons, and beautiful rainbow crayons. These cool crayons are also a great gift for birthdays, holidays, and back to school.