You can find these birthday stencils on Amazon!
You can even create your own stencils using simple patterns and lines. These cupcake from Baking Bites are a good example. You could cut out a letter to make a monogram.
These Culinary Stencils are intricate enough to be wedding appropriate.
Aren't those amazing? A great stencil can make easy work of cake decorating. Have you ever used or made your own stencils?