Living room decorating ideas naturally should flow from a particular design style. That does not mean that the style should dictate all your ideas, though. My opinion is that rooms look best when a home design style meets the personality of the designer and in accordance to the home owners.
Country - friendly and casual, earthy tones, often lighter woods, vintage inflection.
European - England, France and Italy are the countries typically referred as European decorating. English Country, Victorian, French Country, French, Italian and Tuscan decorating styles fall under European home decorating style.
Mission - natural materials, geometric design, back to basics feel.
Here is a brief list of living room design styles:
Traditional design - classic and comfortable, no surprises, very predictable.
Asian - intricate detail, bold color, natural influences, peace and serenity includes Chinese, Feng-Shui, Yin-Yang and Japanese styles especially.
Country - friendly and casual, earthy tones, often lighter woods, vintage inflection.
Rustic - charm, style, texture with woods, twigs, and animal accents, these days its quite sophisticated as well. Rustic interior decorating designs can be further sub-divided into country, southwestern and western styles.
European - England, France and Italy are the countries typically referred as European decorating. English Country, Victorian, French Country, French, Italian and Tuscan decorating styles fall under European home decorating style.
Mission - natural materials, geometric design, back to basics feel.
Contemporary Style - "the style of the day", sleek, clean lines, spare and unique.
Southwest style - Native American influences, kokopellis, bright blues, reds, and oranges with earth tones.
These are some of the basic styles, which you can utilize while making an out plan for decorating your living room themes. There are many sub-styles as well which I will write about in my blogs soon. You can learn more about decorating styles for home interiors. The biggest thing to remember about style is not to worry about completely true to any one style. Mix and merge different things up as apposite.