1960`s artwork

[capricorn62]

Can you help me find a picture for me?
Similar to the Guinness "White horses galloping through seafoam".
It was popular during `60`/70`s , Landscape approx12" x 36" ,long narrow picture blue/green with no land in view. Saw this once on Antiques Roadshow but would love to buy it. Been searching for ages .

[swedeheart]

Walter Crane's Neptune's Horses was one of the inspirations for the commercial, but of course it wasn't painted in the sixties or seventies - whether or not it was popular at that time, I've no idea.

http://i50.tinypic.com/5mxv6f.jpg

It was painted in 1892.