Ocean Gradient

A very soft digital gradient moves from deep navy through turquoise into pale aqua with no objects.

This gradient rewards careful comparison of neighboring blues. Keep the deepest navy apart from turquoise until the direction of the blend is clear, then use the pale aqua pieces to close the lighter edge. There are no objects to interrupt the field, so a steady left-to-right sort is more useful than searching for a single focal point. A slow pass around ocean gradient will usually reveal the small color changes that are easy to miss at first.