The ghosting is crap. I know this. It should be available a better version.
You can "turn off" the most of it when you edit the file /root of your memory/Programs/xmahjongg/_tileset
Content should be:
# Rename attached _tileset.txt
# Replace the file /root of your memory/Programs/xmahjongg/_tileset
with the new one.
The "real" tileset looks nice but it is a ghosting night mare because of the grey colour. The "dorothys" works much better.