Ask it in the Homeowner's Forum. It's not a small world, either. The Wallcoverings Association estimates there are 100,000 patterns available on the North American market. The Sherwin-Williams retailers also maintain a database of motifs that can streamline the selection process. A few fundamentals can help you put your project in focus.
Small spaces seem bigger to the eye when papered with small prints.
By the same token, oversized rooms can be made more intimate with large patterns. Geometric motifs make shallow rooms appear deeper, while short walls and hallways can be stretched with horizontal patterns. Use vertical lines to emphasize the height of a room. Because they absorb light rather than reflect it, darker tones are good at hiding uneven walls and other flaws. For the same reason, walls with dark coverings appear to close in on one another.