Thank You Notes For Coaches Thank You/football Notes For Kids?

Thank you/football notes for kids? - thank you notes for coaches

My husband and I coach football at 9-11 years for a local company in Arizona. We are planning a pizza party on Saturday, and we would spend little cards thanks for being such great players and fun. We want to have a budget of Nice, but serious. Any suggestions on this? I searched online, but there's really nothing to say, "I have to wear that!" Please help!