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Large, Full, Customizeable Hydrangea Door Wreath for Spring and Summer, 24 Wreath With Monogram. $75.00, via Etsy.
Candy Cane Holiday Wreath- This is probably the easiest idea to have your kids do. The styrofoam ring can be found in the craft section/store, yarn and any decorations you like to add. Wrap the yarn and tie off. Use yarn to tie the decorations on also. No gluing necessary. Instead of yarn you could use strips of wrapping paper and tape it around the ring.
I made a S for the front door. It turned out super cute. I eventually will add the monogram to a wreath with flowers, but as of now, my S looks good by itself.
Love this for a year round letter to hang on the door of a house! (Twine Wrapped Letter- Would be super cheap- All supplies available at Hobby Lobby for less than 4 dollars.)