We like this because it shows some real innovation: A safety tool that kids will think is cool. If your kid has a peanut allergy, it's serious business, but when your Charlie or Lucy is at school you can't monitor everything they put in their mouths. These "No Nuts Please!" tattoos are a great idea and give your kid street cred. Stick a warning on their arms (yes, arms, even if you're tempted to put it on their foreheads) as a reminder to both your little nibbler and the teacher that anything with nuts is off limits. Nut Allergy Tattoos, $10 for six at MyPreciousKid.com.