Possible Clues:

• Paper directed at new union members
• It's thrown over bride and groom
• Celebratory scraps of coloured paper thrown at weddings
• Mix of tin, etc, cast only for union celebration
• Parade litter
• Matching paper?
• Throw it at the wedding, it's in bits
• The paper covering the wedding is thrown out of church
• This gets thrown around a lot at union meeting with bits from paper
• Paper coverage connected with unions?