Well, I just made this one in about ten minutes with some free printables from the HP Summer Celebration newsletter. I love these mini paper flags. I can think of so many uses for them.
I also made this cool retro garland. It makes me think of an old-fashioned couty fair.
And finally, I printed out this mad-libs-type sheet about July 4th for my daughter to fill out with her friends, great for a quick family-friendly party activity.
The HP Summer Celebration newsletter has tons of great summer entertaining ideas, free printables, recipes, crafts, and photo tips. It's definitely worth a look!