I think I have found a solution to stop iOS 10 making wallpapers grey.
If you zoom in on your wallpaper when setting it, this appears to keep your background bright and not apply that grey look.
If you make it original size i.e. Not zoomed in to make it bigger then that is when it seems to be grey and not the original colour.
Hope it works for you as that appears to be working with me.
If you zoom in on your wallpaper when setting it, this appears to keep your background bright and not apply that grey look.
If you make it original size i.e. Not zoomed in to make it bigger then that is when it seems to be grey and not the original colour.
Hope it works for you as that appears to be working with me.