Family/extended family pictures. Fun colors and idea. Wouldn't have to be beach theme but I like the idea of not trying to make the little ones sit and smile when you can catch so much more of their sweet personalities with something like this!
Unposed Posing: A few Tried and True Tips for Photographing Families in Natural and Fun Ways. Guest post and photography by Lynsey Peterson. http://digital-photography-school.com/unposed-posing-a-few-tried-and-true-tips-for-photographing-families-in-natural-and-fun-ways