Abstract: A panel is disclosed formed of sheet material, the panel having opposite edges and being profiled to include a plurality of formations spaced along the length of the panel and extending between the edges, each formation including a substantially convex section and a substantially concave section which meet at a peak, and wherein each formation meets an adjoining formation at a trough.

Abstract: An easily-installed groutless wall tile plank backsplash system includes plural lower tile planks positioned edgewise spaced from each other in a horizontal direction of a wall in a lower plane. Plural upper tile planks have a decorative surface and edge finish, optionally three-dimensional, and are positioned edgewise spaced apart from each other in a second, upper plane. The lower and upper planks are configured such that facing inner edges of two nearest neighbor adjacent lower planks in the lower plane are covered by a single upper plank positioned over the inner edges of the adjacent lower planks in the upper plane. The planks are secured by an adhesive without mechanical fasteners, substantially reducing installation time. In order to custom fit a wall space, the spacing between adjacent upper planks and adjacent lower planks is variable. For emphasis, a lower tile plank can be a large decorative mural tile plank.