This depends on where you do business and which flag or flags Some countries restrict or prohibit the use of their national flag in this way, but won't necessarily bother about some other flag You need to consult an attorney in each country where you plan to do business, and give him a list of flags that you are thinking of using.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.