Some alternate Norwegian flags.
At one point in time a white saltire (diagonal cross) on red was used to represent Norway. I decided to experiment with this, eventually combining it with the OTL modern Norwegian flag. It was hard to make sure the flags didn't resemble those of the Confederate States of America or that of Great Britain too much.
The first flag is a national flag, used by government agencies, civil organisations (regardless of whether they're connected to the government or not) and military organisations.
The second flag is a combined naval and state ensign, used by non-military government ships (e.g. those of the coast guard) and military ships (i.e. those of the navy).
The third flag is a civil ensign, used by privately-owned ships.