I agree with the Betsey idea or something with Gwen Stefani such as the Harajuku Lovers. All the girls would look so cute on compacts! Disney princesses would be great or Minnie Mouse! I guess all of this can be called "childish" but I think the majority of us think it's cute, regardless of our age. I feel like it can cater to a lot of us as women. All leopard print stuff would rock! Full on leopard packaging!
I was hoping that for the Hello Kitty collection they would do all the original characters. I think colored compacts would be awesome. Purple for Pocchaco or pink for Spottie Dottie.
A glitter line! All the packaging be super glittery (where it wouldn't come off). Even original mac packaging with just a black glittery look would look cool.