Example Sites

https://scontent.xx.fbcdn.net/v/t1.0-0/p130x130/13677_538650322812782_322385592_n.png?_nc_cat=110&_nc_ht=scontent.xx&oh=4e23be4884b91f87a0de7abaae63b295&oe=5D0FBF8D
Promoted brands running the them "Clean" http://www.promotedbrands.com