These are all for children... but...
While walking through Wal-mart yesterday I had some brilliant ideas... so I will share them with you.
A bubble machine. It would not be in the picture, but the bubbles would be of course.
Old timey looking washtubs and towels to match boys and girls.
Fairie wings from the dollar store for little girls. Same with boa's.
Top hats and ties to do shots of little boys in their diapers.
Also, like someone else mentioned for the different themes there are many flowers. At the studio I work at we have a whiet silk sheet and a box of fake rose petals and a single rose. For little girls its so cute.
We have all kinds of artificial flowers and petals and leaves...as well as seashells and a basket of fake fruit from the floral dept.
Wagons from the toy dept. Cute antique chairs.
Do what I did, walk around looking at everything and think to yourself, what I could I do with this to make a beautiful photo...
Good luck!