Buy kbu3-456-18-243 rice bowl [4.34 x 2.37 inch] Japanese tabletop kitchen dish Dye
Dry rice makes a great medium for kids to play with. You can make a mini sandbox filled with rice that they can play in with trucks or action figures. White rice isn't very exciting though. It is very easy to dye rice whatever colors you want using food coloring.
For the Classroom
Rainbow sensory play guide: how to dye sensory bin fillers from oats to rice to salt from And Next Comes L