"Wallpaper samples" refers to small pieces or swatches of wallpaper that are given or shown to people so they can see how the wallpaper would look or feel before they decide to buy or use it. Full definition
Their humorous and ironic subject matter combines domestic symbolism with excerpts from figurative moments extracted from recent paintings, as well as boldly patterned strips of wallpaper samples. (regenprojects.com)
I've been using wallpaper samples and change them out periodically. (theinspiredroom.net)
The owner's husband added extra shelves in the studio for fabrics and the owner has colour coded them with wallpaper samples, so everything stays tidy. (idealhome.co.uk)