Just start striping on the colors. They don't have to be perfect and just use a Q-tip to remove what gets on your skin.
My colors pre-toothpicked.
Now the fun part,. Take a toothpick and drag it through the colors . I suggest changing your toothpick or wiping it between strokes because the last color will get in your first color. eg. I got some blue in my red.
The end result is fun toes that can remind us of warmer weather.