My grandfather was a professional wall paperer. When he retired, he and my grandmother bought a ranch style house that he promptly wall papered. Every room had a different color, print, and even texture of wall paper. It was like a house collage. The living room had an open wall to the dining room so basically it was a great room. And yet, the living room and dining room had different wall paper patterns and colors as if they would never be viewed together. The kitchen had a bar that opened into the dining room and you guessed it, the kitchen had it's own flavor of wall paper.
This spontaneous, use what you have on hand, style of decorating creates a unique, although hodge podge, look for your home. If you want a more polished look