Niece's (husband's) birthday is coming up in a month.

Need some ideas...she is turning 3!

She likes penguins and flip flops!
I was thinking a plush penguin backpack.
Know of any cool flip flop brands?
Or any other ideas spinning off of penguins & flip flops?

I'm not sure if we got her a personalized story book already if not we'll be getting that as well from I See Me!