Use off-white heavy fabric chair and sofa covers sold at most major stores. This will bring your chosen room, like a den or living room together nicely. Throw pillows are great for setting a theme for coastal living, but don't get too cutesy if you enjoy a more pulled together look.
Rearrange the furniture in your room away from walls and embrace a fireplace, window with a great view, or a piece of art that really speaks in the room.
At my Zazzle store, Gypsea, you'll find hanging and desk lamps in many colors and designs. Tablecloths, throw pillows, blankets, bedding, door mats, bathroom mats & shower curtains, stone coasters and too many items to list here. All are original art designs and will bring your home alive. Remember that all the extra coastal touches you add with accessories will really make the space yours.