From the author of The Big Book of Window Displays: The Art & Business of Irresistible Windows comes these examples:
Yes, you want your shop to look festive all the holiday season long. No, you don’t have much time, money, or space.
Well, here’s some inspiration you (with, maybe, a little help from friends & family!) can do in one hour, andleave up from now til 2016…
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Like trees, but crave some eye-catching color in your display? Washi tape!
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Or maybe a festive valance would suit your shop’s branding better. Try ornaments:
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Or yard-sized candy canes!
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TRULY one-hour (or less!) is my favorite off-the-cuff holiday look. Take a big brush and some water-based paint, and do a big yellow star inspired by this heart.
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If you have a steady hand, use this as inspiration for a window pen painting spree. Try three per window, high enough to not obscure your merchandise display:
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If you have a few minutes to spare, leave tiny doodle messages in the corners of your mirrors throughout your shop:
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Auntie Kate The Resale Expert 
[…] this week. Fight back with motivation on your site and blog, massively festive social media posts, display windows that’ll have them braking as they drive by. Pull out all the stops, and don’t be afraid […]
These are great, thank you
You’re welcome, Tonia.