Paint the room's walls a fresh white color to create a crisp backdrop for the grey-and-yellow color scheme. Use lemon or butter yellow paint, depending on the shade you're decorating with, if you prefer the walls have a bit of color.
Add grey furniture pieces. Choose a couch and love seat set featuring light- or medium-grey upholstery in the living room. Decorate a bedroom with a silver-grey bed headboard, nightstand and computer desk set for a sleek style.
Add yellow textiles to liven up the rooms. Place yellow decorative pillows featuring white flower patterns on the grey couch and love seat. Enhance the bedroom with a comforter featuring shades of grey, yellow, white and even orange for a bright pop of color.
Incorporate touches of white into the grey-and-yellow decor scheme to create a clean, fresh look. Place a modern, all-white lamp on a couch side table, desk or nightstand. Hang gauzy white curtains, which will provide an eye-catching contrast against yellow walls, in a living room or bedroom. Place plush, fluffy rugs on hardwood or tile floors.
Accessorize with vibrant yellow accents. Place a butter yellow reading chair in a room filled with grey furniture. Set off a wall shelf with a white milk glass vase filled with a yellow tulip or rose bouquet. Liven up a coffee table with a square, clear glass vase full of real or faux lemons. Suspend a chandelier featuring yellow crystal touches from a living room or bedroom ceiling for an unexpected look.