This is the most awesome thank you 'deck' I've ever seen! What I didn't catch on to at the party, was why Heather was asking all the kids what their fav recipe was, and then writing them down. Here's an example of my daughter's favorite:
Recipe for: Cheese
Ingredients: cheese, bread
Oven temp: 3 degrees
Cook time: 4 minutes
Directions: Put it on a sandwich
Heather put together all the kids recipes on separate cards. Then put a stack of photos together, with a photo of the guest behind their particular recipe. Brilliant!!