Zedge.net and zedge app has good collection of ringtone, wallpaperss.they update all category regularly basis.
I choose zedge for downloading wallpapers and ringtone. it has very large category which is very good for finding any content.
The doewnload cost is free which is good. Quality of the wallpaper is high for any screen.
Its interface is attractive and easy to find anything from this site so use this site.