First, begin by choosing an anchor fabric. Be sure it is a pattern that you love, because it is the main pattern by which you will be choosing the other fabrics.
For your anchor fabric, choose a pattern with a minimum of three colors. Choose two more fabrics, each having one or two of the anchor fabric colors in their pattern. Vary the three fabrics in contrast. One fabric should be light, one medium and one dark.
Change the scale or size of the patterns by choosing one fabric with a large pattern, one medium and one small. Solids fall into the small-pattern category. Using all the same size patterns will cause each one to overpower the other. Of course, fabric decisions will depend upon your room’s ‘design styles’. This means that a particular style will require a specific material pattern. You don’t want to use large tropical florals with an Americana or Modern style.
Do some on-line research if necessary to find a special fabric style and pattern that works with your style. You will find a lot of companies that supply design style fabrics and coordinating materials. The ideal room would have both smooth- and rough-textured fabrics, so choose fabrics of varying texture. Look at wools (roughly textured), cottons (smooth) and silks (ultra smooth).
Also, consider fabrics with sequins, beads or other embellishments to get a wider variety of textures and looks.