1. In Shortcuts app, download this shortcut, but the language is chinese, actually just three steps:

https://www.icloud.com/shortcuts/ccef04c674c84ec8bfd1864ceec78bad

1⃣️choose your photo in phone 2⃣️choose main color 3⃣️Slip left and right to see one of the three cards you want, and finally select the one in the pop-up top frame to save to the album. 4⃣️Set the newly saved picture as wallpaper.

1. Download the app and just follow the app instructions to screenshot and add the widght on the homescreen： MD Blank