Design made by putting together coloured pieces of glass or stones

One word substitute is Mosaic.

Oleograph: a print textured to resemble an oil painting.
Mosaic: a picture or pattern produced by arranging together small pieces of stone, tile, glass, etc.
Tracery: ornamental stone openwork, typically in the upper part of a Gothic window.
Relief: a feeling of reassurance and relaxation following release from anxiety or distress.