I have a load of them in various places on my computer; a lot I stole from the disk images from the original games. I will see what I can gather together and upload to my github.
Some of the converted ones can be found on the AI memorial page, if you go to the file format and then click on the sample image, it will download all the images in that game for that platform. Adventure International Memorial - Formats
(Apologies for the HTML on that page - I wrote the pages back in 1999 and have never updated them as I no longer have access to that server.)