PowerPoint comes with dozens of free shapes; circles, stars and even smiley faces are only a few clicks away. If you don't find a shape you like, draw your own using the built-in free-form drawing ...
If you want to use PowerPoint's capabilities to illustrate how two or more data points compare in magnitude, it might be appropriate in some cases to use proportional shapes to make the comparison.
How to add multiple flashing stars in a PowerPoint slide Your email has been sent If one star in your Microsoft PowerPoint presentation is fun, then lots of stars ...