Have you checked out Blue Knight Rubber Stamps lately? If not, you might be surprised to see that they now have a line of stencils. Each one includes a standard stencil as well as a thinner one making them so easy to stamp through. Of course, the package also includes the mask pieces as well.
I blended black ink in the stencil to create a silhouette of a dolphin. I also used sentiments from the BKRS Blessings One Line Sentiments stamp set when making this card.