The presence of water itself is not required. In the dry garden of karesansui style, the sea is symbolized by grey gravel or sand and the state of the sea is expressed by sand patterns or samon created by raking the sand to form certain designs.
zen garden towel
zen garden, throw pillow.
zen garden candy dish
zen garden cover for mobile phone
DIY "zen garden." I am an inveterate doodler when I'm trying to think, but making patterns in sand like this would be even more soothing.