A connector toy assembly comprising: a plurality of card-like structures, each card-like structure including a first card edge and an opposed second card edge; and a rectangle-shaped, first end cap connector including (i) a top side, (ii) an opposed bottom side, (iii) four edges that define a perimeter of the first end cap connector, the four edges extending between the top side and the bottom side of the first end cap connector, (iv) four first slots that are formed into the top side of the first end cap connector, each of the first slots being positioned parallel to two of the four edges and parallel to one other of the first slots of the first end cap connector, each of the first slots being positioned spaced apart from the perimeter of the first end cap connector, each of the first slots being positioned spaced apart from each of the other first slots of the first end cap connector, and each of the first slots being sized and shaped to receive one of the first card edge and the second card edge of one of the plurality of card-like structures, (v) a first concentric connection pattern formed on the top side of the first end cap connector between the four first slots, and (vi) a second concentric connection pattern formed on the bottom side of the first end cap connector, said second concentric connection pattern being suitable for receiving the first concentric connection pattern of another end cap connector. a plurality of card-like structures, each card-like structure including a first card edge and an opposed second card edge; and a rectangle-shaped, first end cap connector including (i) a top side, (ii) an opposed bottom side, (iii) four edges that define a perimeter of the first end cap connector, the four edges extending between the top side and the bottom side of the first end cap connector, (iv) four first slots that are formed into the top side of the first end cap connector, each of the first slots being positioned parallel to two of the four edges and parallel to one other of the first slots of the first end cap connector, each of the first slots being positioned spaced apart from the perimeter of the first end cap connector, each of the first slots being positioned spaced apart from each of the other first slots of the first end cap connector, and each of the first slots being sized and shaped to receive one of the first card edge and the second card edge of one of the plurality of card-like structures, (v) a first concentric connection pattern formed on the top side of the first end cap connector between the four first slots, and (vi) a second concentric connection pattern formed on the bottom side of the first end cap connector, said second concentric connection pattern being suitable for receiving the first concentric connection pattern of another end cap connector. (i) a top side, (ii) an opposed bottom side, (iii) four edges that define a perimeter of the first end cap connector, the four edges extending between the top side and the bottom side of the first end cap connector, (iv) four first slots that are formed into the top side of the first end cap connector, each of the first slots being positioned parallel to two of the four edges and parallel to one other of the first slots of the first end cap connector, each of the first slots being positioned spaced apart from the perimeter of the first end cap connector, each of the first slots being positioned spaced apart from each of the other first slots of the first end cap connector, and each of the first slots being sized and shaped to receive one of the first card edge and the second card edge of one of the plurality of card-like structures, (v) a first concentric connection pattern formed on the top side of the first end cap connector between the four first slots, and (vi) a second concentric connection pattern formed on the bottom side of the first end cap connector, said second concentric connection pattern being suitable for receiving the first concentric connection pattern of another end cap connector.