Flip flops birthday card. Flip Flops Birthday Card "Flip Flop Frenzy" - BDG13703. This colorful greeting card features a grouping of colorful flip flops on the beach. On the inside it reads, "Have a no-shoes, no-shirt, no-problem kind of day. Happy Birthday". Measures approx 7 1/4" x 5 1/2". Coordinated envelope included. Made in the USA with recycled paper.