Russell and Kevin from the movie up! make shift boy scout uniform and a blue hoodie with a blue felt cape, feathers made from felt and a slit cut at the top of hoodie. Bill should go as russell and I as Kevin, after all Kevin is a girl.
Flintstones - adorable Lauren Davison Davison Davison Valencia - this is perfect for addi and gray!!
ET costume. I like the addition of the bike handles. and instead of a light, you can toss some glow sticks in there for an extra fun party.