Abstract: A toy building block is comprised of a slotted interlocking brick that contains a slot for receiving planar material. The slotted toy building block may be provided in a kit with the planar material to be received within the slot. The slotted toy building block and planar material may also be provided in a kit that is contained within a package that includes one or more planar surfaces, with the planar material being removed from the one or more planar surfaces. The building block kit may also include one or more other toy building blocks that comprise interlocking bricks that are configured for attachment to a waste item.