Here's the default wallpaper from the 2019 Notebook 9 Pro and Notebook 9 Pen up for downloading if you'd like. Link also in the comments. I posted this before a while ago
wallpaper for desktop, laptop | vo31-galaxy-7-edge-samsung-blue-pattern
Samsung logo, qa, samsung, sss, galaxy, HD wallpaper | Peakpx
wallpaper for desktop, laptop | wa76-galaxy-s8-blue-pattern-background- samsung