Shape and size: Squares should be 18 to 24 inches across, large enough to showcase a solid color or a pattern. Oblongs are a nice foil, since they’re “a little less expected,” says Katie Ridder, an interior decorator in New York City. Fabric: A limited color palette and large geometric prints on smooth, tightly woven fabrics, like cotton and linen, work well in a modern environment. But if you love having lots of colors, take a tip that applies to all settings: “Pull them from a piece of art that’s in the room,” says Andrew Flesher, an interior designer with Gunkelman Flesher Interior Design, in Minneapolis. Trim: Most trim is traditional, but if you want to use it, make sure it mirrors the pillow’s primary hue to “add interest but retain a solid block of color,” says Flesher. Shape and size: The right size depends on how big your sofa is, but for eye-pleasing proportions, try pairing square pillows measuring 20 to 22 inches across with smaller squares or circles. Fabric: Velvet and silk look great in a classic setting. Layering a variety of textures, patterns, and colors keeps things lively. “Sometimes more is more,” says Flesher. To help patterns such as paisleys and florals mingle without looking fussy, Donovan suggests pairing a busy pattern with a simple one, like “a complicated plaid with a large floral that’s just two or three colors.” A print and a coordinating solid will work, too. Trim: Save the big trim, like tassel fringe, for larger pillows “to give them more oomph,” says Scott Salvator, an interior designer in New York City. Small pillows look best with slim trim, like a braid or cord. Shape and size: Pick similarly sized pillows to tie together a diverse collection. Generally, interior designers prefer a few large pillows―18 to 24 inches across―over a mishmash of smaller ones. Fabric: Be open but not random. You can have a couple of pillows that match or five pillows in five different fabrics, but make sure there’s at least one color in common to give the arrangement unity. Trim: Avoid excess and keep trim simple. You can express yourself more through fabrics. Box pillows with their square shoulders can be attractive in an eclectic grouping and look great when edged with braid, says Leigh Anne Nomberg, an interior designer with Bill Ingram Architect, in Birmingham, Alabama.
