A decorative moulding for a building wall comprises a profiled body with a back side for attachment to the building wall and a front side, the profiled body having a recess on the back side for accommodating a LED ribbon and a coating film attached on the front side. The profiled body is made of translucent light-diffusing material.

A crown moulding system includes at least one first member that may be coupled to a horizontal support surface. At least one second member is provided. The at least one second member may be coupled to the vertical support surface. A panel is removably coupled between the at least one first member and the at least one second member. Thus, the at least one first member, the at least one second member and the panel may present the appearance of crown moulding. At least one line is provided. The at least one line is positioned behind the panel such that the at least one line may be concealed.

A flexible inside corner trim piece is formed with concave depressions at hinge portions where wings attach to the body. The trim piece can be formed such that wings and a top cap lay flat in plane perpendicular to body or wings and top cap curve at an angle. Hinge portions can be narrow or wide and symmetrical or asymmetrical. The trim piece can be dyed, paintable, or present another decorative surface. The trim piece can include embedded lighting.

Provided is a method of installing a tile mosaic upon a vertical concrete surface. The method includes providing a plurality of tiles, a tile support, and a concrete form. The plurality of tiles are adhered to the tile support to define a mosaic assembly. The tiles are positioned on the tile support corresponding to the mosaic. The mosaic assembly is connected to the concrete form, and concrete is poured within the concrete form such that a portion of the tiles become embedded within the concrete. The tile support is subsequently detached from the concrete form and the concrete form is removed from the hardened concrete. The tile support is additionally removed from the plurality of tiles to reveal the mosaic on vertical surface of the concrete structure.

A reglet may include a first base extending in a first plane. A reglet may include a first backbone integrally formed with and extending from the first base in a second plane that is substantially perpendicular to the first plane. A reglet may include a first mud flange integrally formed with and extending from the first backbone in a third plane that is substantially perpendicular to the second plane and substantially parallel to and spaced apart from the first plane. A reglet may include a second side forming an angle of between 0 and 180 degrees with the first side of the reglet, wherein the first side and the second side of the reglet are integrally formed to meet at a corner.

A modular molding system is provided for mounting at a wall-ceiling interface in a structure, such as an RV, and around a window opening in the structure. The system includes a mounting component and a trim component removable mountable to the mounting component. The mounting component is configured in one embodiment to be mounted to the wall-ceiling interface and in another embodiment to be mounted around a window opening. The molding system includes a functional component separate from the function of the molding system. In one embodiment, the functional component is an LED lighting strip and, in another embodiment, the functional component is a guide channel for a screen or sunshade of a window valence. A snap-fit engagement is provided between the mounting component and the trim component. The mounting component and the trim component are extruded plastic so that that the components can be cut to size as desired.

A system comprises a first baseboard element, a second baseboard element, and a spline configured to couple with the first baseboard element and the second baseboard element. Another system comprises a first crown element, a second crown element, and a spline configured to couple with the first crown element and the second crown element. Other embodiments are disclosed herein.