Fine Motor Skills Manipulative

 A basket of popsicle sticks. Baskets at Dollar Tree $1.

 To be put in a jar with a Parmesean container lid (which fits most jars, but not all perfectly, doesn't have to be)

 Get the sticks in the wide mouth or the three hole slots, the popsicles fit in both sides.

 Afterwards try to organize the colors of the popsicle sticks (at dollar tree $1) before you put them in.

This was later used as a musical instrument, one of their favorite sounds.