Colorful Sidewalk Chalk Art by ap., via Flickr
Sidewalk Chalk photo props, this would make some really cool pictures and you can even have the kid help to color in or make some of the background so they don't get bored during the picture process
Bubble blower painting.
Sidewalk Chalk fun props for Summer photos! Easy sidewalk chalk ...
Tissue Paper Fish Craft for Kids and Preschoolers - #Mom4Two
75+ Summer Activities for Kids and Families
Could be fun for our Art Day, if its warm enough outside!
Firework Salt Painting | This looks so fun!
toilet paper roll fireworks