For this activity, you can use pegs, beans, beads, coins, and small toys.
Hide the small objects in the play-dough and ask the child to dig his fingers in and search for the hidden treasure.
Encourage the child to stretch the play-dough and work his fingers in.
When the child finds the treasure, ask him to take the object out using his thumb and pointer to promote pincer grasp.
If using pegs, you can use the pegboard and have the child design a picture on the board or you can ask him to draw lines, shapes, or letters.
If you choose to use beads you can have the child lace them on a string and make a necklace.