My rules for needle felting are the same as my rules for other artful endeavors. There are no rules except the rules that you make for yourself. Use materials and fibers that you like.
Mix colors and textures that you like. If you make something that you do not like, decide what it is that you do not like about it. Store that info away and then put the project in a scrap bag.
You may find a use for it later or find a friend who would just die to have it. If you can't bear to do that, then give yourself permission to use it as a cleaning rag or to throw it away. Needle felting as in any art should free you to do what feels right for you.
I do, however, suggest that you take proper precautions to insure that you do not hurt yourself or others. More.
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.