What you will need:
Ice cube tray
Make coloured ice cubes by adding a drop of food colouring to the water in each section of an ice cub tray. Freeze. Add a bowl of different-coloured ice cubes to the bath for some bath-time fun! If small ice cubes melt too quickly, you can try making a larger block of ice using a clean milk carton or other suitable container, and why not freeze some small plastic toys inside the block and watch your child's surprise as the ice melts and the toys appear!
Courtesy of "The Toddler's Busy Book" by Trish Kuffner