Happy Birthday Cake Card for Nephew: A finely polished cake! This cool birthday card for a nephew is really great in teal and gold, turquoise and pea green colors for a modern-vintage feel. This hip birthday greeting is a great way to wish your nephew a happy birthday. Small gestures go a long way, and this special birthday card is sure to be a treat. The smooth frosted cake is chock-full of candles, so all his birthday wishes can come true!