Irregularly-shaped stones laid flat create classically rugged designs, especially when the stones vary in color. Dips, divots and other irregularities in the stone surface add to the ruggedness. Fairly thick mortar joints, about 1/2 inch in width, complete this rugged look. For the fireplace, go for a simple stone firebox, a rough-hewn wooden mantle and wrought-iron accessories.
Stones that have been cut into flat, smooth, uniform sizes have more refined looks than naturally-shaped stones. These elegant stones look especially refined when they are stacked like bricks in staggered but uniform patterns. For the fireplace, opt for an elegantly carved stone or cast stone fireplace surround. A stone surround frames the firebox opening and often includes an attached mantel across the top. Although they are stone, they do not have a patchwork look. Rather, they are carved from large slabs and carefully pieced together to look as though they were carved from single slabs.
Modern style is typically sleek, simple and minimalist, especially when compared to country, rustic or traditional decorating styles. To create a wall of stone with contemporary flair, use stones that are the same color, texture or size. This keeps the look of the wall clean and modern. Another way to achieve modern-looking stone walls is to lay stones in unexpected ways, such as at slants instead of in straight rows. For the fireplace, install a dramatic glass or stainless steel gas fireplace unit set into the wall.
If the look you're after is a cozy cottage, install a wall of rounded river rock. This option provides plenty of texture. The rounded shape of the rocks is softer and more casual than jagged edges or straight lines. A large fireplace with an arched opening and a sitting-height hearth adds to the coziness. Place a basket filled with marshmallow roasters on the hearth for a homey touch.
Mix it up by combining a variety of stone types, colors and sizes on your wall, randomly or in patterns. You can also mix stone with brick or some other material. Mixing materials breaks up and adds visual interest to massive walls of stone. Other materials to mix with your stone include glass block, tile and petrified wood.