You could get away with a subtle pattern, however, say one with closely blended colors or maybe a textured effect. Soft, smooth textures suggest serenity. A carpet-covered floor is not only soft to the touch, it absorbs sound. Strongly contrasting colors are dramatic. Opposite colors like red and green, blue and orange, or purple and yellow are so different they make each other more intense.
Bold pattern is exciting.
Patterns that have strong contrasts within the design are attention-getters. The more pattern, the more lively the room. Hard and uneven textures are lively. Multilevel or carved carpets have uneven surfaces. Because they absorb light unevenly, they have variations of light and shadow.