I go back and forth between themes on linux. That is one of the great things about linux; the ability to customize and theme just about everything. XFCE has not had a great past reputation on themes due to its limited options. But Noobslabs has a rich library of themes. I tried their MacBuntu for XFCE theme and it looks and works great. It includes the Plank dock. See my desktop below and there is a link at the bottom of the post where you can get this theme complete with instructions how to install it. Enjoy.
You can get the beautiful MacBuntu theme here:
http://www.noobslab.com/2016/04/macbuntu-1604-transformation-pack-for.html
