Related Clues:

• Subway tunnel art, maybe
• Fancy floor, maybe
• Terrazzo, e.g.
• Composite picture
• Fountain basin feature
• Tiled art
• Set pieces?
• Tile art
• Tile collage
• Type of tile
• Many a stained glass window
• Gestalt
• Artistic tilework
• Bit of tile art
• Subway station decoration, perhaps