To dream of wallpaper can be thought of as a defense between yourself and the people in your waking life. It may also indicate that you are hiding a secret from your friends and family. Conversely, it may indicate that there is some part of your life that needs to be spruced up and made more beautiful.
If you dream that you are removing wallpaper from a wall represents that the shields you have put up around you are finally being taken down. You no longer wish to hide from those around you. You are will to share your true self with your waking life friends and family.
The color and pattern of the wallpaper will offer clues as what kind of barrier, secret, or feeling you should focus on.