The Blue Ensign is one of several British ensigns used by organisations or territories associated with the United Kingdom.
Scotland
The australian flag. Blue background, with a union jack in the top left corner, the federation star in the bottom left corner and the southern cross on the right.
The European Union flag is a blue background with a circle of 12 yellow stars.
The Union Jack (Union Flag) is in the upper left-hand corner of the Australia flag. "The Union Jack itself is a composite flag symbolizing the union of the historical components of the United Kingdom. It is composed of intersecting and overlayed red and white vertical and diagonal crosses on blue and white background." Source: http://www.anbg.gov.au/oz/flag-union.html
Blue background with a white saltire (X-shaped cross).A blue flag with a white corner-to-corner cross.To be strictly, heraldically accurate: Azure, a saltire argent.
Fiji's flag represents many things. The shield is the country's coat of arms. The blue background on the flag represents the very important Pacific Ocean. The Union Jack in the upper left corner represents the ties the island has with the UK. The shield is the country's coat of arms.
Norway
It is representing the Scotland flag on the Union Jack.
Finland
It is covered with horizontal blue and white stripes, and in the top left corner there is a white cross (like a + sign) on top of a blue background.
Red, Green, Blue, Yellow and Black rings on a white field.
The Greek flag consists of blue and white colors. The upper left corner features a white cross on a blue background, with the remaining area being filled with blue and white stripes.