Place hot water and glue together in a bowl and mix well so it's combined well. Take your time on this, it will come together. Add food coloring, we used 5 drops of one color and mix well. Stir in starch and mix well. Continue to mix glue mixture, and eventually the liquid will begin to come together, as you will see the mix stick to the spoon and pull away from the sides.

Place the mixture onto a large plate and flatten with your fingers. Place 1/4 cup of foam balls into the mixture and pull the corners of the mixture to the center and knead well. Add an additional 1/4 cup of foam balls and knead until combined well.