Happy New Year 2023 Yard Sign Letters - Happiness New Year’s Eve Yard Décor Happy New Year 2023 Yard Sign Decorations Outdoor with Metal Stakes. Economical and durable, our Coroplast Yard Signs are a staple of outdoor advertising. These Happy New Year Yard Letters full color direct printed graphics are vertically fluted for use with Stakes. Coroplast is typically used for yard, parking, real estate, and election signs. They are waterproof.