Jonathan Adler (photo) is certainly not afraid of color. Note his color scheme: black, white, turquoise--with variation in blue and little pops of yellow.
1. Choose a palette - Some colors just work great together. Chocolate browns and blues, turquoise and pink, brown and yellow, orange and grey. You can create a strong sense of color if you scale down to two or three accent colors that compliment each other. Too many colors makes the room directionless Not enough can make it feel sparse and dead. Survey your home and commit to two or three dominate hues that you love.
Note this interior from Elle Decor (photo). The chair and dresser are stark white, with a black and white rug (neutral) and cream walls. This allows the painting and orange accents to pop. With a simple switcheroo, you could change the accents from orange to blue...no need to reinvest in new furniture.
2. Create a neutral canvas - Create a neutral base in your home so that when your tastes shift, you don't have to start from scratch. Investing in a neutral sofa ( grey, white, cream, beige, brown) will give you greater freedom in incorporating new furnishings--that funky pink Louis chair you just had to splurge on. Your shelving and case goods also play a role in this--choose wood tones to blacks, whites and creams depending on your taste. Designer white walls also look amazing and create a high contrast backdrop for vivid pieces. Have fun with your rugs but designer staples include sisal woven rugs, cream shags and animal hides.
This breakfast nook from Elle Decor (photo) uses art as a medium to bridge the light blue and white color scheme. The bottom row is a grouping of kid's artwork, the top, photography of the children--perhaps the artists themselves. Genius.
Here Jonathan Adler (photo) brings color into this white and marble kitchen though dinnerware and pottery, creating sophistication out of everyday items. Note how the green upholstered dining chair works because it complements the blue accent and is repeated in the small dish on the top shelf.
3. Group by color - Grouping art collections, accessories and accents are the quickest way to make an strong color statement. Display similar items together (no it doesn't all have to match) and pay special attention to how they relate, whether through color, shape, texture or subject. Then, play off that focal point by adding other accents, whether throw pillows, a colorful lampshade or a pair of bookends that pick up some element of your initial grouping.