One embodiment of a system of the present disclosure, among others, can be implemented as follows. A modular wall block system includes a plurality of wall blocks comprising first wall blocks of a first shape and second wall blocks of a second shape and at least one continuous passageway running from a top of a wall to a bottom of the wall formed from the plurality of wall blocks. The wall blocks are configured such that the at least one continuous passageway is formed when a plurality of blocks are laid side by side in a tier and stacked one atop of another to form an additional tier. In a further embodiment, the wall blocks also include third wall blocks of a third shape. Other systems and methods are also provided.