I like the way these treasure baskets are materials focused. Helps the child to compare and contrast objects Treasure Baskets - put little collections in baskets.
Great ideas for DIY baby sensory treasure baskets you can put together in minutes, using things you have around the home.
Treasure Baskets to explore ... filled with ordinary objects that baby can interact with.... great lists of basket contents ideas on this site.
Travel Size Baby Treasure Basket ~ Inspired by Montessori and Reggio Emilia (From The Imagination Tree)