Color recognition, learning patterns, and making letters with unifix cubes. Pre-K literacy or math center activity
Although this website isn't in English, it does have some great letter printables!
Letter Hunt for Early Literacy: A sensory literacy activity for toddlers and preschoolers learning the alphabet.
Set up a simple fine motor activity to work on letter recognition. This letter matching activity can be set up various ways depending on your child's skill level: alphabetical order, uppercase/ lowercase letter recognition, sequencing, etc!