Most of the recipes I found had sugar, or called for straining out the skins on the blueberries. Since so much of the good stuff is in those skins, I came up with my own (much simpler) version.
Add the following to a blender:
8 oz plain yogurt
A handful or two of blueberries
A squirt or two of honey
Blend everything up, and pour into popsicle molds. (You'll get about four regular sized popsicles.)
After that, it's just a matter of chasing your child around the house with paper towels to catch all the drips!