Do your kids have any attachments to objects?
My DS has a "pillow buddy". It's a small pillow black in the front and white in the back and it has a picture printed on fabric sowed on the front of my step niece and nephews. He he carries it around with him(or at least tries to). In the mornings and through out the day I will hear him laughing hysterically, turn to see him rolling around hanging on the the pillow.