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From AllisonStein
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From CristydeKoning
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From BackRoomTreasures
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And finally from me, JYWheeler.
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ACEO stands for Art Card Editions and Originals. The size of an ACEO is always 2.5" by 3.5". They are created in a variety of medias and are highly collectible works of art.
Search "ACETSY" to find a great variety of ACEO's on Etsy