Have you got lots of Woolies collectable cards lying around?
Why not try a quick game of memory with them? Or a sequence memory game?
For memory: Make sure they have the same picture on the back. You may need to paste onto card like I have for the dream works cards. Ensure you have pairs of cards and mix up and place down. Take turns turning two cards over trying to find the pairs.
For sequence memory: adult places a sequence of cards in front of child, starting with 2 or 3. Allow child time to look at them, turn over cards and then child remembers and selects cards from their set and places underneath. Turn over adult set to check.