3D abstract alien background blue bright cave colors colours concept cool creative crystals cubic design detail digital energy fantasy fiction futuristic graphic green infinity landscape lines modern orange otherworld red sci fi science sky structure three dimensional vivid clouds pink yellow aqua above angle angled angles architectural architecture ceiling color colored colour coloured frame framed glass height high light linear long metal metal-framework metal-work perspective perspectives rectangular shaded shadows shaped shapes sky-light skylight skylight-windows structured style sunlight support supporting visibility visible window window-frame windows beautiful black blocks brown cables curled curves decoration fiery figures fire illustration isolated layers magical patterns rainbow rust shades shiny squares stains swirl vibrant white stained glass