My son recently had a superheroes themed birthday party with life-sized superhero mylar balloons. I couldn't bring myself to throw away that much material and found the perfect use for it. Turns out mylar is very easy to work with and makes for a great homemade emergency blanket! An emergency blanket helps regulate body temperature to prevent/counter hypothermia.
Fashionable too I might add. As I am shivering to death at least I will be in style!! I'm kidding.....really!
Step 1: Have a Party - Then Wait
Wait for them to deflate or until your kids don't remember that you have new members of your household. I have to say in the middle of the night having these things lurking around the living room is kind of freaky!
Anyway, it's a good idea to get permission from your kids before cutting up their balloons!! Save yourself a tantrum!