About a year ago I had cut out a variety of felt facial features and face shapes in different sizes, shapes and colours (noses, lips, beards, eyebrows, eyes, hair etc). I put them in a zip-lock sandwich bag and bring them out occasionally for Finn to play with. He comes up with new, and interesting faces every time.
A light, quiet and clean activity for when you are out and about and need to keep little hands busy.
If the child is skilled with scissors they could make their own shapes, and glueing is also an option.