Several years ago, we bought potted "silk flowers" that look so life-like as to defy belief. You store them under plastic and take them out each Christmas. That is how I'd handle this. Most large hobby stores carry them by the thousands.
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Catholics may not use fake flowers on the altar. I imagine we could do something pretty with red and white carnations against greenery, or maybe with holly.
Can’t do that if you’re Catholic, at least not on the altar, in vestibule or along aisles OK. Rubrics specify anything adorning altar or tabernacle must be natural. Our Sacristan even freaks out if you put a plastic ribbon around them. My understanding (although I’m ducking for the flames here) is that this includes Christmas trees on the altar: the evergreens are fine, but no lights, ornaments, etc. Again, if you must have for the kiddies, put in the vestibule, not the sanctuary.