One quick and easy way to preserve them forever would be to make them into Christmas ornaments.
To make an ornament take a picture that they have recently colored (make sure to write the date on it) and laminate it. Then hole punch a hole in the top and lace with ribbon and viola! There you have a homemade ornament of your little one's artwork!
Not only will it be a nice trip down memory lane when setting up your Christmas tree, but they look great in the bows on top of presents for grandparents!
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