This literally takes just a few minutes! Simple, but a fun addition to your 4th of July decorations.
What you'll need...
Polka dot plate ($1 @ Target dollar section)
Acrylic paint (on hand, true blue)
All you do is paint a "4" on the plate & you're done! Or you could even use vinyl.
You can tell my 4 isn't perfect, but I like it :)