Abstract: A peg array assembly includes a housing having an opening and defining an internal volume. The assembly also includes a panel having an array of a plurality of apertures formed therethrough. Each aperture of the panel is configured to receive a respective light-transmitting peg and retain the respective light-transmitting peg until the respective light-transmitting peg is selectively removed from the respective aperture. The peg array assembly is configured to selectively receive a mobile device configured to emit light towards the array of the plurality of apertures. A mobile app may display a design template and/or an animation, and systems include the mobile app and the peg array assembly. Methods include accessing design templates and/or animation libraries via the mobile app, inserting light-transmitting pegs through the panel, and displaying a design and/or animation via the light-transmitting pegs and light emitted from the mobile device or other light source.