To avoid the pitfall of a bland color scheme when using neutrals, balance light, medium, and dark color values of those colors around the room. Pattern size should be compatible with size of furniture and the room. Large rooms and large furniture can use large patterns. Mixing Patterns When combining patterns, establish a common denominator. The common denominator may be the color, the pattern, or the theme of the pattern.
Color is the easiest common denominator to establish.
If different patterns in the same color scheme are used, it's safe to go on adding patterns almost indefinitely, especially when the patterns themselves are simple. Same pattern in different color combinations. Reversing color combinations or using different color combinations of the same pattern are interesting ways to mix patterns. Two or three different color combinations are enough in a room. Same pattern, different sizes, in same color combination.