For more color I put a few squirts of red, blue and green food coloring with a few tablespoons of water in small containers. We added rice to this colorful mixture, gave it a stir as it drank up the water and then put the grains back in the bin.
Eli might argue the best part of the rice bin is cleaning it up. He's good about keeping the mess to a minimum but inevitably there are a few runaways. Eli loves the vacuum...and does a very thorough job for a pipsqueak!