|[please excuse the messy design]|
I feel like I took the more difficult approach, but it did work (to some extent). I wish I had those nail art stencils. >.< After using polish on the stencil, I would get a toothpick and some nail polish remover on a cotton swab and try to clean up the edges as neatly as I could (which wasn't 100% successful, as you can tell.)
The products I used for this nail look is Sinful Colors Snow Me White and Seche Vite Top Coat. I can see this working really nicely with a red/blue base, or even a red/blue base with blue/red dots for accenting.
I do apologize this isn't a neat nail design, but I hope you get some inspiration/star ideas for your fourth of July mani. Have a wonderful week and a safe fourth of July if you are celebrating!