You can buy Black Wallpaper in Yukea or Black Swirl Wallpaper in Horrods as long as you have enough Rox and are at or above the right level.
Black as Night Wallpaper: Yukea level 2
Black Swirl Wallpaper: Horrods level 6
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There is no code for the Disco Wallpaper on Moshi Monsters.
There isn't a code for the lava wallpaper on Moshi Monsters, although you can buy it at DIY in Sludge Street.
You can get the Wavy Borders Wallpaper at the DIY shop on Moshi Monsters. You need a secret code to get the Whacky Wiggly Wallpaper, the Wiggly Wallpaper, the Green Wiggly Wallpaper, the Blue Wiggly Wallpaper, the Pink Wiggly Wallpaper, and the Wild Wiggly Wallpaper.
Glumpcake Wallpaper: adventure Wiggly Wallpaper: port
To get the Wiggly Wallpaper you have to type port into the secret code place when you log in. Then, when you go to your treasure chest, you will have wiggly wallpaper.