National Geographic Silk Violet Cushion Covers ~ Buy 1 Get 1 FREE. These stunning cushion covers retail for $149.99 each. Thai designer Nareenat blends fantasy and pop elegance with the exclusive design of these cushion covers. The cool blue covers are sewn of cotton and decorated with hand-printed batik techniques, featuring ocean blue blooms. Cushions (not included) are inserted through a slit in the back. In conjunction with National Geographic.