A star-shaped decorative object has at least two blanks joined together. At least one of the blanks has a middle part and a plurality of shorter and longer points extending outwardly beyond the middle part. The middle part can be provided with several fold lines running from a midpoint in the direction of at least the longer points and can be folded at fold lines running from the midpoint in the direction of said longer points in a V-shape so that inwardly-folded areas are formed between two neighboring of said fold lines running from the midpoint in the direction of said longer points. The shorter points on the inwardly-folded areas are inserted through openings of another blank in order to join the two blanks for the formation of a hollow, three-dimensional body. A set of blanks to form the decorative object can be provided.