A modular block toy compatible panels and storage unit assembled therefrom for includes modular panels that have at least one surface, or portion thereof, that is compatible with common block toys such as LEGO™, DUPLO™, and other compatible blocks are described. Each panel may have at least one connector or at least one connector portion for connecting to one or more other panels. The panels are modular in nature and can be used in a multitude of ways to create flat, upright, or three-dimensional structures. The present invention also relates to a storage unit assembled using at least one modular block-toy-compatible panel.