Can you Guess the Theme??

I'm working a Caleb's 1st birthday. I've come up with a cute & furious design for his invite, which at the same time I plan on incorporating into the decoration. Here is a sneak peak of the colors I'll be using. Any guesses as to what the theme might be? Roxy, Gabby and Madian you are not allowed to guess. My friend Nati gave me an idea...although I'm not as rich as Oprah, I'll give out FREE Birthday Banner to those who enter into guessing what the theme is. There is a catch you must become a follower so join in and comment after you've become one.
For my international followers...yes I will make sure to ship it out to Costa Rica (since it's the only country I know I have followers from) that is if the winner is from there. So, you may begin with the guessing. Be on the look out for who the winner is, I'll post the winner and more pictures on Friday. Hurry up enter to win a Free Birthday Banner.