Peacock Feather Thank You Cards and White Envelopes - box of 50 These unique thank you cards feature a beautiful blue peacock feather design, and the words thank you on the front of the card in navy blue. Matching white envelopes are included. These beautiful peacock themed thank you cards measure 4 7/8in. x 3 1/2in. Sold in a pack of 50 thank you cards and envelopes.