Another of July project our Pre-k class did. This was a hit with all the kids. Some turned out better then others but overall the craft was a success. Toilet Paper Roll Fireworks Stamp Craft for Kids - Great for a of July art project!
Make your own aqua sand- this stuff is SO COOL! You can build underwater castles and sea sculptures, and the sand comes out of the water DRY. (also links to other cool sand stuff like glow in the dark or sand slime)
Fizzy Rainbow Slush - a beautiful sensory experience from Fun at Home with Kids 1 part baking soda to one part water, add liquid water color or food coloring.after mixing, add vinegar for fizzing if desired.