These are some photos that i found using google image searches researching my idea.

All of these photos symbolize war and fighting,

The painting of the poppies and a cross conveys the idea of death and injury in war but at the same time it is a beautiful image that gets the point across clearly.

The two photographs underneath it show show just how many people are effected by war and how many people never come back.

The red in most of these images symbolize the blood shed and injury's in war, the green could symbolize the need to camouflage in with the earth.

The painting at the top of this post only really has in it the two colors that symbolize the earth and blood shed and injury it also has black as the only other color in it which, in this case symbolizes death and loss. the fact that it is a painting i think shows closeness and emotion, it gives a very dark feeling to the picture more than if it was a photo which i think would have given a cold and distant feeling to it.