More homeowners are looking at wallpaper as an investment, like a piece of art. Whether it's for a half wall above the chair railing in the dining room or a full wall in a bedroom, large floral designs in lively and bold colors are the order of the day. Textured coverings, like grass cloth, offer an organic feel. Oversized damask pieces add drama and reflect the owner's personality. Prices vary. Firms like Farrow & Ball charge more than $200 a roll for their Victorian-inspired prints, but they are beautiful. Companies like Graham & Brown, Schumacher, and Thibaut offer beautiful cutting-edge designs for less than $50 a roll. Home improvement stores, like Lowes and Home Depot, have many choices. To calculate how much paper you will need, multiply the space's width in feet by its height, then divide by 50. A standard roll covers about 56 square feet. Though prices are quoted in single rolls, they are usually sold in double rolls at twice the single-roll price. If you want a professional wallpaper hanger, prices vary but count on $2 per square foot. If the paper has a pattern that must be matched and you haven't papered before, choose a professional.