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Use an upside down Command hook on the backside of a door to hang a wreath - 31 Home Decor Hacks That Are Borderline Genius
Large, Full, Customizeable Hydrangea Door Wreath for Spring and Summer, 24 Wreath With Monogram. $75.00, via Etsy.
Command Hook solution for seasonal banners. This would work for hanging Christmas lights, too.