This is a law firm that does mediation practice. The target is attorneys and their clients who are involved in litigation. They want to settle their cases and be able to move on. They want hope. They want peace.
Greans and maybe browns. Think colors that belong in nature.
A leaf (perhaps an oak leaf). Greenish color. As in "turning a new leaf." I have an image of a falling oak leaf, Elegantly simple and calming. Please no motion lines; just a leaf.