The ball whisk is a relatively new invention, and consists of about six stainless steel balls at the end of normal whisk wire. The balls vibrate and allow you to maneuver your whisk through a bowl more easily, and whisk more with less effort.
You can purchase a silicone spatula in a rainbow of colors. What makes it useful rather than just colorful is that it scrape cake batter with the best of them and it stands up to high heat, making it a versatile addition to your kitchen.
A good quality wooden spoon is essential to your kitchen. Preferences for size, shape and weight vary by chef, so look for something that feels good, sturdy and easy to maneuver.