The Tarot cards pictures come from the deck found on wikicommons (the script used to cut them is available at frontends/src/wix/images/split_card.sh), and available at http://upload.wikimedia.org/wikipedia/commons/8/8d/Tarotcards.jpg under Creative Commons BY-SA. The authors shown on the site are Piast and Svick. The splitted cards are, according to the license, available under the same conditions.
Notice that the Creative Common BY-SA apply only to this directory