Posing for an official photo session in the State Rooms of London's St. James's Palace, Kate wore a figure-flattering deep blue dress that matched the shade of her amazing engagement ring — an 18-carat sapphire and diamond ring that was Princess Diana's engagement ring. Inspired by Kate's beautiful blues, I took a look at some home decor pieces that reflected the shade Kate was wearing. My favorite piece is definitely the Louisa Settee ($2,500). To double up on the blues in the settee, I'd paper a wall with the Amy Butler Sun and Moon Wallpaper ($85). If you're curious about Kate and William's history, check out these surprising facts about the couple!