I have used the traditional symbols for peace in these 3 different concepts.
Concept 1: Olive branch --- This is a wide check pattern whose main theme is the green olive branch, the calmness of 3 variations of blue and white.
Concept 3: The white dove over a sea of blue.
Concept 4: Peace Islands -- Smaller checks have been created on the diagonal in order to depict an island of white sandy beach (2 greys), trees(2 greens) and the ocean (2 blues). The repeated pattern shows a chain of islands seperated by blue sea.