I've done texture play with my kids ever since Logan was the size of Kian in the above picture. The kids love it, it's easy to find the supplies on hand, and it's great for preschoolers. I basically just fill a bowl with a substance, provide plenty of spoons, containers, and other kitchen gadgets, and go grab time to fold laundry while they go at it. Oh, and before I get to my laundry, we talk about what it feels like, smells like, and if applicable, what it tastes like. That's why texture play is a great preschool activity. It's a lesson in the senses.
I think this day they were playing with baby powder. I have had a lot sitting around from our pre cloth diapering days. They sure smelled good after they were done.
Felicity discovered that baby powder makes good clouds.