My firefly is one! For his birthday outfit I used Patty Young's Natalie&Nate pattern, the boy version. The fabric is from Eric Carle's Very Lonely Firefly collection. The lining fabric is Brown Bear or Very Hungry Caterpillar - I forgot which one.
I also embellished a romper for him with a firefly star. We now have five people in our family - so a star seems just right as our family symbol. His older brother requested a matching tshirt, so he got an orange one with the star appliqued in the middle as well.