You will need:
2 x paper plates (or you could cut circles from a cardboard box)
4 x lolly sticks or similar
1 x balloon
Felt tips / Sharpies / Paint
I like the idea of a relatively safe (just watch the ornaments) indoor tennis game. I also like the fact you can be as creative as you like with your rackets. You also might need to eat a few lollies before tackling this project.