Color Picking 101: It's easier than you think

Step 5 More Options

I also personally like to pick up the actual color chips in addition to the coordinated brochure (this is a big perk to chain stores as opposed to little stores, no one bothers you when you walk out with a huge bag of paint chips).

Notice the Valspar chips have neat little windows on them to match things with, and the Behr/Disney chips are dual colored.