Wallpaper and fabrics are a good place to start:
And, these two lovely fabrics by Emily Bond are perfect for a child's bedroom.
Nautical mirrors like this Ship's Mirror ......
Or, accessories in colours that are a reminder of the sea such as this useful jute basket in "seaspray"
Rugs ......
Decorative hanging fish...
A seashore scented bar of soap or candle
We all like to incorporate some of our favourite things from outside into the home whether obvious or subtle and living by the sea is very inspirational when it comes to styling . And, it certainly doesn't have to cost much - a simple piece of driftwood found on the beach or a collection of pebbles in a jar are just as attractive as any bought items.
Have fun!