Yes, it is still the year of the sea and Sea Liverpool and I don't think I can take much more marine-related art but this is JMW Turner and one should never miss an opportunity to admire some original Turners. Apparently, nearly a third of Turners paintings represent the sea, these are just a few from the Tate's collection.
There are several of his rapidly-executed watercolour studies of sea and sky. I love the contrast between the grand detailed oils and the very simple watercolours.

Turner - The Sea at Liverpool Tate until April 23rd 2006, free admission.