Inspired by observing some glass cooktop cleaner, my mom was reminiscing about decorating the windows with snowflakes when she was a child. She would use a glass cleaner that went on pink but, dried white, dabbed on through stencils. The cooktop cleaner dries to a similar finish.
After a trip to the local craft stores yielded disappointment instead of stencils she liked, I cut some out of cheap cardstock on the Glowforge (I ordered some mylar sheets for any similar future use).
As a bonus, cleanup should be pretty easy.
The cutouts ended up in her tree.