Just zipping around a few countries before I leave Europe. Norway, Portugal and Montenegro.
A bit of background info courtesy of Wikipedia...
There are no special meanings associated with the colors used in the flag of Norway. The cross symbolizes Christianity and its blue color symbolizes the association with Sweden and a white outline added while red is for Denmark. The tricolors denote Norway's independence.
The flag of Montenegro was officially adopted with the Law on the state symbols and the statehood day of Montenegro on 13 July 2004 at the proposal of the government of Montenegro. It was constitutionally sanctioned with the proclamation of the Constitution on 22 October 2007. It is a red banner with broader golden edges all around the red field with the coat of arms of Montenegro in its center.
The flag of Portugal (Portuguese: Bandeira de Portugal) is a rectangular bicolour with a field divided into green on the hoist, and red on the fly. The lesser version of the national coat of arms (armillary sphere and Portuguese shield) is centered over the colour boundary at equal distance from the upper and lower edges. On 30 June 1911, less than a year after the downfall of the constitutional monarchy, this design was officially adopted for the new national flag of the First Portuguese Republic,