Here I want post some PaintBox artworks from the past that I found.
(I got tired of loading them into the editor one by one, so I wrote myself a python script to convert them to PNG)

At first, some more well known images:

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Here is archive with all original files.
I change extension to .PBX (to distinguish from other image formats).

I investigated out of curiosity the C128-version of the space shuttle image (COLUMBIA) extracted from the VDC DEMO .D71 image file mentioned earlier.
It's stored on the disk as a sequential file (SEQ), and should be a bitmap image compressed with a machine code tool which is present on the same disk.
Unfortunately no info about decompressing the same file, found only an example in dutch how to save and load the compressed picture.