So I know that Nail Polish doesn't sound like food, but these are.
Because both of my girls have summer birthdays, I usually do a 1/2 birthday treat for them to take to school.
This is what Bella picked for hers:
All I did was melt candy wafers (they come in a TON of colors are craft stores, so I didn't even have to color it), on low in the microwave. Then I dipped a marshmallow in it. Before the candy cooled, I stuck a tootsie roll on top.