I found the following About.com explanation quite interesting:

“Blue conveys importance and confidence without being somber or sinister, hence the blue power suit of the corporate world and the blue uniforms of police officers. Long considered a corporate colour, blue, especially medium and darker blues, is associated with intelligence, stability, unity, and conservatism.”

Feature Image via Pinterest. From top left: Gorgeous Blue Server – Tonic Design / Glass Votive Candle  – Mr. Price Home / Awesome Imported Chair by Parri – Can be ordered through us! / Scatter Cushions – @Home / Turquoise Ceramic Pots  – Le Grange Interiors / Teal Velvet Quilt – Mr. Price Home / Indian Chest – Weylandts / Blue Glass Vases – @Home

Feature Image via House To Home. From top left: Blue Perspex Pendant Light – Can be ordered through us! / Gorgeous Ginger Jar Fabric from Hertex  – Can be ordered through us!  / Oriental Jar with Lid – Le Grange Interiors / Turquoise Protea Scatter Cushion – Mr. Price Home / Ruffled Scatter Cushion – @Home / Oriental Statue – Farriers / Blue Perspex Pendant Light – Can be ordered through us! / Striped Throw – Mr. Price Home / Blue Glass Pots – Le Grange Interiors / Ikat Cushions – Loads of Living / Perspex Stool – Marcel Wanders available through Crema Design