Poster suggestion 1.
Crossword puzzle with words concerning the war in Syria. In the middle of the words "Save Syria" is also a map of said country.

Poster suggestion 2.
Same theme, focusing on the children suffering from the war. The rugged teddy bear symbolizes how the war affects the children. 
Underneath the bear is an upside-down map of Syria. It is a shadow of the bear but also a pool of blood.