On an upcoming trip, I will be visiting some old friends who I haven’t seen in so long that they have each created one six-year-old girl and one four-year-old boy since I last saw them. I’d like to bring some small gifts for the kiddies, but am completely stumped; I usually get books for kids if I don’t know their tastes, but the children in question are not English-speaking (they speak French and German respectively), so books are somewhat problematic.
What are some good gift ideas for little kids? Preferably things that a) have somewhat universal appeal, and b) are uniquely American and therefore likely to be something that they don’t already have? More help is needed for the boy gifts; having once been a six-year-old girl, I have a somewhat better grip on what they might like.