Blues and aquas are calming. They can create a strong and powerful statement or be cool, relaxed, light and friendly. Almost everyone likes some shade of blue.
Create a harmonious look with subtle contrast by combining light and dark shades of blues and aquas. Use blue with green for a natural, watery palette. Add grey for understated elegance. Sky blue and robin's egg blue, especially when combined with neutral light browns or ambers are a lovely combination. Throw in a dash of blue to cool down a hot red or orange theme. Create impact with the contrast of blue and yellow, or blue and orange. Dark blue with white is fresh, crisp, and nautical.
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