If you are enjoying using E16 and want to try extra themes, you can download all of them from
GitHub - dharrop/themes: Enlightenment e16 themes (all of them in one shot) or from http://themes.effx.us/e16 (which includes detailed installing instructions)
then copy them in your local directory:
~ ❯❯❯ ls .e16/themes/
~ ❯❯❯
But, I told you that the versions of Elive that includes E16 already includes a set of the best themes