Our spring themed sensory tub has lots of silk flowers & leaves, pinecones, and a variety of insects and butterflies. My daughter (22 months) loves to hide the insects under the leaves and then acts surprised when she find them. It's quite entertaining, for both of us! We have begun to talk about colors and she can find something that is red, green, blue, or yellow. Of course she has to name every item that she finds that is pink...and lucky for me there are about a hundred pink flowers to keep her busy!