when hanging frames, draw imaginary lines. Line Art (top): If you have a generous amount of horizontal wall space, draw an imaginary line on your wall and place artwork, photos or decorative plates above and below the line so your display feels balanced.
Great way to fill the space over a sofa with a mix of floral art. Note how the colors and motif is brought down to the sofa with a great mix of pillows. via BHG - Free Decor Ideas: Your Decorating Hotline
Re-Thinking the Gallery Wall: 8 More Funky & Fun Ideas (Match the frames to the wall color. It'll make the art pop and look sleek and dramatic, to boot, just like in this living room seen on A Beautiful Mess.