This app was mentioned in 6 comments, with an average of 1.33 upvotes
https://play.google.com/store/apps/details?id=com.joko.fracta&hl=en
Not for Wallpaper Engine, but for Android: Fracta
Have been using it for a while https://play.google.com/store/apps/details?id=com.joko.fracta&hl=en