Wallpaper is a great tool for decoupage. You can find scraps in all shapes and sizes to suit your needs, either at thrift stores, on Ebay or in the attics of your relatives who may have stock from redecorations past. Get out the Mod Podge and go to town!
Wallpaper stairs by Good Housekeeping
Tables via Mother Earth Living
Wallpaper headboard by Martha Stewart
Wallpaper drawer by A Cultivated Nest