A grid system apparatus comprising a substantially planar base member and an attachment member. The base member has an upper surface and a lower surface opposite of the upper surface. The attachment member is mounted to the lower surface of the base and is compatible with the lower surface of the base which facilitates releasable attachment of the base member to an outside surface. The base member and the attachment member are configured as a plurality of border members which cooperate to define a plurality of voids therebetween. The border members include a plurality of outer border members defining an outer periphery thereof, and a plurality of inner border members defining the plurality of voids. The outer border members and the inner border members interface at intersection regions.