My daughter is too old for the letter matching task, but love the idea of the clothes-pins. Going to make more complicated, teen-friendly game and use the clothes-pin instead. They would be great for her fine-motor skills and hand strength.
Paint Bag Writing: Add some paint to a plastic bag, seal it up & spend the afternoon with your kids drawing designs through the paint. Using a Q-tip instead of your finger to avoid tearing a hole in the bag.