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A structure is configured to be flat in an unassembled position and to form a three-dimensional structure in an assembled position. The structure includes a plurality of adjacent panels coupled together along fold lines with each panel including a foam core covered on one surface by a flexible skin.

A structure is configured to be flat in an unassembled position and to form a three-dimensional structure in an assembled position. The structure includes a plurality of adjacent panels coupled together along fold lines with each panel including a foam core covered on one surface by a flexible skin. The flexible skin is continuous between the adjacent panels that are coupled together for forming a respective fold line for the adjacent panels to be brought together at a right angle to each other along the fold line. The foam core of each panel includes a mitered surface along abutting edges to form a miter joint when adjacent panels are brought together. Slots are formed in the panel cores adjacent to mitered surfaces. Brackets span a miter joint between adjacent panels, holding the spanned miter joint and panels together in a three-dimensional structure.

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1. A structure configured to be flat in an unassembled position and to form a three-dimensional structure in an assembled position, comprising: a plurality of adjacent panels coupled together along fold lines;each panel including a foam core covered on one surface by a flexible skin, the flexible sk

1. A structure configured to be flat in an unassembled position and to form a three-dimensional structure in an assembled position, comprising: a plurality of adjacent panels coupled together along fold lines;each panel including a foam core covered on one surface by a flexible skin, the flexible skin being continuous between the adjacent panels that are coupled together for forming a respective fold line for the adjacent panels to be brought together at a right angle to each other along the fold line;the foam core of each panel including a mitered surface along at least one edge thereof, the mitered surfaces of adjacent panels configured to form a miter joint when the panels are brought together;at least one keyhole slot formed in at least two adjacent panel cores proximate to the respective mitered surface of the panel core, each keyhole slot including a wider section and a narrow section and the keyhole slots of adjacent panels positioned on opposite sides of a formed miter joint when the at least two adjacent panels are brought together;at least one bracket having two portions forming a right angle with each other and configured to span a miter joint between adjacent panels, each bracket portion including a respective hook portion extending along an edge thereof to form opposing hook portions, the opposing hook portions configured to engage the wider sections of respective keyhole slots on opposite sides of the formed miter joint and slide into the narrow sections of the respective keyhole slots of adjacent panel cores when the bracket spans the miter joint, at least one hook portion of a bracket including a cutting edge configured for cutting into a panel core and the hook portions further configured to grip the respective panel cores in the narrow sections of the keyhole slots for holding the spanned miter joint and panels together in a three-dimensional structure. 2. The structure of claim 1 wherein the keyhole slots are formed on an internal surface of the panel cores. 3. The structure of claim 1 wherein the keyhole slots are formed on an outside surface of the panel cores. 4. The structure of claim 1 wherein the keyhole slots include a plurality of narrow sections for receiving a plurality of brackets. 5. The structure of claim 1 wherein the at least one bracket includes a mounting portion for mounting the structure to a support surface. 6. The structure of claim 1 wherein the plurality of adjacent panels includes a center panel having edges for coupling other adjacent panels along respective fold lines, the panels being brought together around the center panel to form a box structure. 7. The structure of claim 1 wherein the flexible skin is formed of at least one of vinyl or synthetic paper. 8. The structure of claim 1 wherein the foam core is formed of polystyrene. 9. The structure of claim 1 wherein the foam core has a thickness in the range of ¼ inch to 5 inches. 10. A three-dimensional structure, comprising: a plurality of adjacent panels coupled together at right angles with respect to each other, each panel including a foam core and coupled together along fold lines with at least one additional panel;the adjacent panels all covered by a flexible skin, the flexible skin being continuous between the adjacent panels to form the respective fold lines between panels;the foam cores of adjacent panels forming a miter joint between the panels;a keyhole slot formed in each of at least two adjacent panel cores proximate to the miter joint between the panels, the slots being positioned on opposite sides of a formed miter joint and having a wider section and a narrow section;at least one bracket having two portions forming a right angle with each other and spanning a miter joint in the structure, the bracket including opposing hook portions engaging the narrow sections of respective keyhole slots in the panel cores on opposite sides of the formed miter joint, at least one hook portion of a bracket including a cutting edge configured for cutting into a panel core and the hook portions configured for gripping the respective panel cores in the narrow sections of the keyhole slots for holding the panels together in the three-dimensional structure. 11. The structure of claim 10 wherein the keyhole slots are formed on an internal surface of the panel cores. 12. The structure of claim 10 wherein the keyhole slots are formed on an outside surface of the panel cores. 13. The structure of claim 10 wherein the keyhole slots include a plurality of narrow sections for receiving a plurality of brackets. 14. The structure of claim 10 wherein the at least one bracket includes a mounting portion for mounting the structure to a support surface. 15. The structure of claim 10 wherein the plurality of adjacent panels includes a center panel having edges and adjacent panels along respective fold lines at the edges of the center panel wherein the three-dimensional structure forms a box structure. 16. The structure of claim 10 wherein the flexible skin is formed of at least one of vinyl or synthetic paper. 17. The structure of claim 10 wherein the foam core is formed of polystyrene. 18. The structure of claim 10 wherein the foam core has a thickness in the range of ¼ inch to 5 inches.