More to explore:
Halloween window - paper silhouettes
bloody good zombie party decor tutorial. it's just wax paper and paint
Just cut from black paper, tape to a window and turn the lights on. Maybe use a sheer orange curtain behind?
Heartland Paper: Halloween Window Decor on Studio 5
"Bloodify" Windows with a little wax paper & red paint
paper leaves in the window
I do this with black construction paper and an exacto knife. Tape paper together for big things like a witch, coffin, mummy, tree etc. Sooo many possibilities!
Wax paper bows