Web colors:

SELECT ?web_color ?web_colorLabel ?CSS_color_keyword ?sRGB_color_hex_triplet ?subclass_of ?subclass_ofLabel ?named_after ?named_afterLabel WHERE {
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  ?web_color wdt:P8112 ?CSS_color_keyword.
  OPTIONAL { ?web_color wdt:P465 ?sRGB_color_hex_triplet. }
  OPTIONAL { ?web_color wdt:P279 ?subclass_of. }
  OPTIONAL { ?web_color wdt:P138 ?named_after. }
}

Try it!