Arrange about 4 beautiful mint leaves at the bottom of the rice paper, then about 4 shrimp halves. Top with a lettuce leaf, a small handful of vermicelli and a small handful of bean sprouts. Add additional mint leaves. That's the moment when you can actually add pretty much anything you have in mind -and in you fridge- (think cilantro, peanuts, chicken, parsley...). Top with a second lettuce leaf. Always keep about 2 inches uncovered on each side.