Created novel multi-scale fabrication technique to realize large-area structural color. Utilized chemical self-assembly to achieve sub-10 nm gaps between metals to demonstrate spectrally-selective perfect absorbers. Combined with top-down large-scale patterning to realize multi-spectral pixels and ~10,000 plasmonic combinatorial colors. Promising for transformative breakthroughs of e.g. photodetectors and imaging devices (Advanced Materials 27, 8028 (2015), Advanced Materials 29, 1602971 (2017)).