Possible Clues:

• Arcs of colour in the sky
• Heavenly arcs
• Shower surprises
• Colourful arcs associated with pots of gold
• They're so colourful, those boraws!
• Natural coloured arcs
• Natural effects when 4 bends
• Colourful phenomena of artist in ribbons
• Post-storm effects
• Young Guides having unattainable hopes