I bought really cheap white rice and dyed it with food colouring. I found the best way to do this was to use the liquid food colouring (I used some out of date colour I had). Place the rice into a food bag and massage the colour into the rice - once all covered pour it onto a tray and let it dry out.
I had two deep bins and then my trusty tuff tray and placed rubber measuring spoons, plastic eggs with things hidden in then (stars, chicks and rice), plastic shot glasses, coloured lolly sticks, flowers, egg cartons and a little basket that acted like a sieve (got to love the freebies on the front of Cbeebies Magazine). Chops and her friend also delved into the plastics cupboard (a cupboard that I let them play in with pots and cups). This meant lots of filling and pouring. They also turned the eggs into shakers and Chops had fun making 'drinks' by putting rice in the little cups with the lolly sticks as straws.
It did get very messy but so easy to sweep up and the they helped do that too with their 'mini me' broom and brush set. A great activity.