I dyed some rice green and left some natural. Then, I filled it with all things green, like buttons, erasers, pompoms, and pebbles. G LOVES this bucket! He can sift through and find the tiny objects that are hidden in the rice and he also loves to scoop and pour the rice.
More Ideas to Try:
Playing with Your 21 Month Old
Learning with Your 19 Month Old
Learning with Your 18 Month Old
Learning with Your 17 Month Old