Cut a clean milk carton in half (length-wise) and freeze with coloured water. I have even popped a few favourite toys in it, like Lego, when it is freezing. A boring bath-time will become exciting as the kids watch the coloured "boat" melt and float around, waiting for the toy to be free! This is especially a good idea when you have a feverish child and are trying to lower their temperature in a "tepid bath." Happy Boating!!!