We took a trip to the Gulf recently and stayed at a mid-century beach house. There were some details that seemed pretty cliche for a beach house, but the might add some interest to a landlocked home.
A driftwood medicine cabinet, which could look great in a modern or industrial bathroom.
A boat window in the shower
And a mid-century modern front door with a porthole window
All three in a home (plus plenty of other beach-themed items that I didn't take photos of) is overkill, but one by itself adds an interesting quirk to your home.