Neatly painted Oars for nautical wall decorations, for example. Just in case you're neither a thrift store treasure hunter nor a DIYer, and you're thinking of buying decorative oars online, these cute oars could be a cheery addition to a nautical sunrooom or porch. More choices here: Painted Oars DIY or Buy.
I'd hang this Beach Sign anywhere! It's made from driftwood letters.
And a couple of Wicker Starfish could be the perfect beach wall decoration for a cottage style room.
Fun Theme Mirror to brighten a corner in a hallway or a powder room.
Or this rustic Nautical Rope Mirror.
Maybe even a Personalized Life Ring! Sometimes venturing out to the "younger" section of a store can lead to great discoveries. Also check out Pottery Barn Teenagers!