Select throw pillows with a contrasting color from the light blue sofa. Butter-colored yellow or a chocolate brown enhance the blue shade without overwhelming it.
Arrange different sizes of throw pillows on the sofa. Set large yellow or orange pillows on each end of the couch, coupled with a smaller pillow with a shade of light or dark brown. The differing colors in the pillows highlight the blue in the sofa.
Decorate with round pillows instead of the standard square. Or integrate one or two round dark blue pillows between yellow or brown square pillows.
Look for throw pillows with patterns such as green and yellow plaid, or in a different fabric texture from your blue sofa. For instance, use satin or cloth throw pillows against a blue leather sofa. Placing patterned pillows against a solid color brings out the texture in both pieces. Differing fabrics also showcase each other in a complementary fashion.