What you need:
Straws
Tape
Paper Plate
nail polish
Start off with a white base
Next, tape you fingers..do not skip this step! I did and my hands were purple for 2 days lol
Then pour your nail polish on your paper plate. After you have done this dip the straw in the paint for at least 10 seconds and then blow on to nail. I suggest using thinner straws, I think mine were a litte too wide and was a little harder to get onto the nail.
And finally your should have this..of course you can choose any colors this is was for 4th of July :)
There are also so many of these tutorials floating around the internet this is the way I saw it done so I hope it works for you :)
Thaks for reading :)