Our hs multicultural club did a mural on this very subject! It was kept
simple so alot of students could work on it. A core group of students did
most of the brainstorming for ideas. Giving "starter ideas" sometimes helps
with 'kick starting' the brainstorming sessions. A descriptive title of
their mural is "Sowing the seeds of peace" It shows a mother, father and
children planting a garden of flowers that have peace symbols on them. It
sounds a bit korny but it is very effective. The mother and father are done
in b & w and the children are of various ehthnic backgrounds.
Good luck! Hope this helps!