Beginner Variation: Kick the ball up, let it bounce, and repeat this until you develop the basic technique and timing.
You're Juggling: Once you have the basic technique and timing, try keeping the ball up with only the tops of your feet.
Show Off To Everyone: Try to juggle with different parts of your body: inside and outside of your feet, thighs, head, etc.
Challenge Yourself: Try kicking the ball high in the air and continuing to juggle as you receive it.
You're a Juggling Wizard: Challenge a friend to a game of 2 touch. You each have 2 touches to keep it up until someone messes up.