All the Nordic countrys have flags that, when turned the right way - look like inverted crosses. Maybe it was a last "F-YOU!" to the crusaders from way back? Just thought it was kind of funny and mildly interesting. Does anyone know WHY they picked those designs exactly?
It's slightly pre-dates those crusades I'm afraid. Wikipedia Nordic cross.
It was first used on the Danish flag and seems to have just got quite popular.