Yin and Yang
I chose Yin and Yang because they are two absolute opposites that swirl in harmony to each other and contrast each other. Yin in Yang juxtapose each other because they move together simultaneously but both represent two completely different things in the universe.
Nuketree
This image represents both good indicated by the tree on the top half of the image and evil indicated by the massive nuclear explosion on the bottom half of the image. Both pieces of the image fit together perfectly but still show the contrast between the two.
Mona Lisa
The Mona Lisa is a symbol of culture that our world holds on the highest of pedestals. While the Mona Lisa has a bright and uplifting portrait in the foreground, there are also dark menacing details in the background. This painting happens to be a juxtaposition in itself.