Something completely different, a whitewashed stone candle holder with a glass container from Willow House. The candle holder allows you to add a little Sea Glass!
Or pick a pretty bowl! So adorable. It shows off hand collected seashells beautifully. Via The Decorated House.
Lots of space here to create a little Beach Zen with Rocks and sand. Via Country Home & Interiors.
A lovely vase as featured on Coiled Rope Art Display Ideas.
I also like the tray display idea. Perfectly beachy with a thin layer of sand and a few shells added. Via Wunderweib.
Hurricane vases come in many different designs to fit your style. How about Caron's Beach House Starfish Etched Hurricane Candle Holder for example! You can use these outdoors too since the flame is protected. Create a grouping of two or three, using different heights. Featured on Decorating with Seashells.
Similar candle holder display idea, using cylinder vases. A simple design with clean lines that goes well with a modern look. Seen on Chris Lang Weddings.
Lanterns are so charming and have lots of character. Just add a few beach finds to them! They are, obviously, perfect for outdoors, but I like them inside too. Pottery Barn has a wide selection of lanterns.
And the last idea, unique hanging candle holders from Our Boat House. The Rope gives them great nautical appeal!