We play ball, tug of war, and sometimes playing ball with Kacee turns into tug of war when she doesn't want to give it back.
Playing hide 'n seek is usually fun for yorkies. They are quite good at finding us!
She is sometimes content to just lay on the the back of the couch watching the world go by, just as long as my arm is wrapped around her, so she can use it for a pillow.
You can play with little pieces of kibble. Shoot them across a floor like marbles.
Get a puppet (dog if you can find one) and play with your yorkie as if your puppet is just another yorkie.
Put a few pieces of gravel or small stones in a plastic bottle and put the bottle in an old sock. She should have a great time with it.