Systems and methods of connecting plates form structures such as roof coverings, awnings, wall coverings, floor coverings, ceiling coverings, decorative sculptures and the like. Each plate is configured to connect to at least one adjacent plate to form a structure of interconnected plates. Fastening surfaces are provided for securing the structure of interconnected plates to a further structure, such as a roof, a wall or framework of, for example, a window or door awning. Each plate has edges that are folded over toward opposing sides of the plate. The folded-over edges form channels on opposite facing sides of the plate which receive folded-over edges of other plates to. connect the plates together in a structure of interconnected plates. The plates may be rectangular, square, trapezoidal or triangle shaped.