Haswell, Broadwell and Skylake shares the same customization items on Windows 10.
Kaby Lake ThinkPad generation (xx70 and T25) had Windows 10 Signature Edition installed. Unfortunately, eight wallpapers which were added are copyrighted, so they can't be shared on this website. Because of this, T25 archive have only single wallpaper (out of nine). I also have T470p archive, but can't share it for the same reason as before.
Files locations: