After a few successful attempts I have put together the following diagram:
materials: cup of water, toothpick, q-tip, Vaseline, 3(more or less) nail polishes, paper towels
Put some Vaseline around one of your nails and on the finger up to the 2nd joint, but make sure that none gets on your nail or the polish will not stick to it.
Drip polish quickly onto the water alternating colors until there is a good amount floating on the surface.
Using the toothpick, quickly drag through the polish until desired design occurs.
Take the Vaseline finger with the nail pointed parallel to the polish surface dip it straight down onto an area you like.
Keep your finger in the water and under the polish surface.
Take the toothpick and clean the excess polish off the surface of the water. You may need to wait a moment for it to dry before it pulls easily off of the water.
Take your finger out and carefully clean polish off of the area surrounding the nail. The polish should slide right off if there was enough Vaseline covering your skin.
Repeat.
Repeat.
A photo of my nails. I used a white base coat, baby blue, navy blue, and silvery purple for the marbling, and added some sparkles with a toothpick.







