A special tabbed pattern is integrated into a series of forms. The forms may be cookie cutters adapted to cut baked dough or other material set to desired density to provide a series of panels corresponding to the cutters. Alternatively, the forms may be molds, e.g, adapted to receive melted chocolate which is allowed to cool and set to form a series of panels corresponding to the molds. The panels are adapted to be joined together to form a decorative structure. The tabs are sized and positioned to provide a dovetail joint along each edge of the structure. The protruding tabs or ends are of a slightly smaller dimension than the notches that they fit inside of to provide a secure fit. This self-interlocking design allows each individual piece of the structure to be fitted together, one at a time, while maintaining an acceptable degree of stability throughout the assembly process.