Here's what I made, and don't take it wrong, it might be simple, but it wasn't easy to make. There's a good few discarded 13x13 cm water colourings at the rubbish bin - one of them actually the favourite of my husband.
I coloured the ocean with Salty Sea and Mermaid Lagoon Distress Inks, sprinkled some colour from the brush to add some life and added the die with Joy! Craft's Seashore die. I wrote the text with Distress Marker Broken China.