The common colors for the coastal living room interior are blue, grey and white. If you use the lightest color shades they would work fine with the interior because they do make nice combination. In order to make a complementary theme in the room you need some wall art decals, accessories and theme related decorative items such as beach theme pillows. What type of beach symbol should be present on the pillow? Some people ask a question as what type of symbols to add in the room that express the beach in different ways. Hanging a nice seascape painting symbolizes a place where water is abundance, likewise a painting with sand and boats symbolize the beach. A simple anchor sign on the pillow symbolizes that the theme is related to water, sailing and boats. It is just a matter of time and research that you will understand how to pick the nice theme related accessories from the market.