To stencil your own stuff:
Buy a roll of freezer paper (approx. $3.99) or beg a piece from the guy in the meat department at your grocery store. Draw your design on it and cut it out with an X-acto knife. Then iron the paper, shiny side down, onto the fabric you're going to stencil. Iron another sheet to the back of the fabric to keep the paint from soaking through. You can use the iron setting that corresponds to the fabric you're stenciling.
With a foam brush, stenciling brush, kitchen sponge, or other paint brush, apply fabric paint to the cut-away areas. I used Jacquard brand textile paint from the local art store.
Let the paint dry (use a hairdryer if you're the impatient type, like me.) Peel the freezer paper off. Set the paint by following the directions on the jar — usually ironing will set it. Ta da.
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