A wall panel system includes a first wall panel and a second wall panel. The first wall panel has a first groove extending along a first end portion and a second groove extending along a second end portion. The second wall panel has a third groove extending along a third end portion. The wall panel system further includes a spline including first and second spline tongues, wherein the first spline tongue is mateable with the first groove and the second spline tongue is mateable with the third groove.