Yes there is
You will find wallpaper to buy at the DIY shop in Monstro City. Items change often so you may need to keep checking back.
go to the bizzare bazzar on the main st at around level 4.
how to get angel on moshi monsters:any 2 pepper any 1 magic
You have to go to the login screen, type your information in, and in the last box type in the code: adventure Add me! I'm aquarain17