I made these last summer when I tried the July 2011 menu from Once a Month Mom. My Hubby was requesting these, so while he was on travel, the kids and I (and Mom the photographer) made up a bunch. He was thrilled when he got home and these were waiting in the freezer. They are a healthy, cold, refreshing summer treat.
As for making with the kids, my eight year old sliced the bananas and poured in all the fruit. My five year old put in all the liquids. Then my eight year old used a measuring cup to divide up the mixture into single serve containers (you can see them behind my son). It was a great group activity!