First generation (now obsolete) stencil from OSHStencils.com:
About to be used:
As you can see in the first two images, there were some accuracy issues, frayed edges in particular.
As you can see in the following image, the 2nd generation stencils have drastically improved! The component with the smallest structures is a DFN10 package (ATtiny13A).
I haven’t had a chance of testing the improved stencils yet – run out of boards.
As of recently, you can also buy a ‘stencil jig’ from OSHStencils. It’s either black or white acrylic and comes in two 90°-angle pieces.