Stencils can be found in the Block Library under EQ7 Libraries > 07 Stencils. You can also draw your own stencils on the Block Worktable!
When designing quilts, you should place your quilting stencils on Layer 3 of the Quilt Worktable.
Use the Set Block tool to set stencils on Layer 3. Drag-and-drop makes setting stencils super easy! Any block that you set on Layer 3 will appear as a stencil and can be colored with the Set Thread tool.
Try rotating the stencil 45 degrees (below, left) or reducing the size and repeating multiple times in the same block (below, right).
The stencil used in the illustrations above is from Quilting Designs, Vol. 8.