Glass jars, a trip down to the nearest beach and some pillar candles (try Tiger Stores) and you're away! No beach nearby? Use rice, like above.
Marine and nautical style lighting will instantly make you feel like you're in a cabin. Look to Hicken Lighting for industrial pendants to get started.
Cheesy, sea life inspired motifs be gone. Subtly and tastefully bring the theme into kids' bathrooms. Check out contemporary prints by Yukari Sweeney!
Using rope and sturdy hooks for hanging mirrors and shelving have been big trends this past year. Their reliability and strength make them perfect components in the bathroom. Look to Flanagans for similar mirror styles. If you fancy a bit of DIY, then IKEA is the place for LACK shelves you can hack.
And nothing will say you do like to be beside the seaside more than shells and stone finishes against a light teal and crisp white canvas. Look to Crown Paints range of blues and greens to find the seaside hue for you.