Any tips on how to make the cool marble designs?

Tip #1: After dropping each color of nail polish into the water, use the stir stick to gently blend the polishes (working quickly!) to create a marble design on the surface of the water.

Tip #2: Dip only one nail at a time and use the other end of the stir stick to remove excess polish.

Tip #3: Empty and refill the beaker with fresh water and repeat the same steps for the rest of your nails.