There is no official wallpaper.
There are only the official logos. Please only publish your own work.
Please no AI pictures. The AI uses existing works that may infringe copyrights.
AI is not a tool like Blender, Inkscape or Gimp and Krita. Here, like true artists, the designer sits with his painting tools in front of a blank canvas.
If you are active in the forum you are more likely to upload pictures.
Note, these are converted to jpg and are lossy.
Greetings from the Garuda Linux Art Director 
Post here. 