I found this purely by accident when I wanted to make some ribbon charms but had no color ink in my printer. Taking regular color images of tarot cards and desaturating them in Photoshop so I could color them in with markers wasn't working. So I went to the ever-useful Google Images, and that was that.
Color Your Own Tarot Cards!
There are two decks available at the link: the Coleman-Waite 1910 deck and one based on the Vacchetta Tarot of 1893.
If you decide to hit this up, send me images of your custom colored cards and I'll post them here in the blog: