I couldn't find any good app where I could download quality QHD wallpapers so I thought I would make this thread here for everybody else to discover awesome high quality wallpapers.
You are welcome to post whatever awesome wallpaper you find on the internet that is Galaxy S6 screen resolution or higher.
I'm starting off with these: Here you will find only the refined wallpapers, it means that I'm carefully picking wallpapers that are only good quality, looking good on lock and home screen and are not stretched.