1) Beautiful arcs 2) Colorful arcs 3) Colorful arcs in the sky 4) Colorful sky arcs 5) Colors in the mists 6) Heavenly arcs 7) Post-shower sights 8) Post-storm effects 9) Post-storm phenomena 10) Slang for phenobarbital 11) Some people chase them Found on https://www.crosswordclues.com/clue/rainbows