If you're on the hunt for a crowd-pleasing appetizer to serve at your 4th of July barbecue, look no further than crostini. Topped with some of our favorite fruits and veggies, these scrumptious snacks are sure to satisfy guests' cravings for fresh watermelon, corn, peaches and so much more. Pick a fave to serve at your next soiree, or let these 15 recipes (+1 bonus link!) inspire your own customized creations.