Clothes pegs are a fantastic thing to play with for children. The pincer grip they need to open and close them, is very similar to the grip they need for learning to write, so it’s a wonderful and fun way to develop those muscles.
Simply put some pegs into a container and peg them onto the sides of the container. Best if the container walls are quite thin and not too thick
Put some cotton balls into one container, then using a peg, one at a time transfer them to the other container.
If you have colored pegs (usually the plastic ones are different colors), you can sort them into the different colors. Additionally you can peg socks or facewashers onto some string or a wire clothes drying rack, or you can peg the clothespegs onto some cardboard.