Most of these are images downloaded from links on the Kyodai web page and resized (ImageMagick) and converted to GIF format for x-mahjongg to use. Please note that I created none of the Kyodai-set images....they are all from other websites. Unfortunately, they had to be renamed to make the Tcl code reasonable, and allow swapping out images easy in the future, so their original identity has been lost to this purpose. (However many of them show identifying text in the lower right most tiles in the image, so check there for the original authors.) The websites sources all indicated the images were free to download and use, so I took the liberty to do so.
As I go back and identify the various sites I took these tiles from, I will post the links here:
The images below are for web page display here and much reduced from the actual tilesets.