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Why didn't I think of this? Use a Low Temperature Hot Glue Gun to Make Snowflakes on your Windows! If you are afraid that they will be hard to remove, you could always spray pam on a cookie sheet, make the designs on there and then just adhere them to the windows afterwards. That way they're reusable too!
Make your design or saying with hot glue on wax paper first. Peel off when cool. Place glue stencil on your fabric or paper. Then add your paint by spraying, flicking paint (like from an old toothbrush), or use stencil brush. Voila! DIY Hot Glue Stencils / Stenciling (on clothing) via lilblueboo.com