Encourage a thoroughly festive birthday with these fun Thoroughly Mod Birthday Cards. Featuring a retro-inspired design complete with rainbow-colored circles and red foil accents that surround a “Happy Birthday” wish, this business birthday card is great for colleagues and employees with a vintage spirit. Cards for Causes can create custom birthday cards with whatever message and signature you desire inside. We also contribute 20 percent of your order total to a charity you choose at checkout. These mod birthday cards are made from recycled paper and come with red-lined, white envelopes.