Hi, JennyGardener, I just went through a period where I used the Celestial associated for that day, but those are discontinued, so I don't know if you'd be able to get them.
However, I totally agree with any or all of the four Stations of the Sun and Tarot: The Sun. They're really awesome, and would be great for Sundays. I just wanted to especially mention it, since the Tarots are being discontinued, in case you wanted to get one before they're gone. I don't think you'll be disappointed.
I haven't tried Tarot: The Moon for Monday (only Luna, the celestial,) but that's another thought.
I'll be watching this thread, too, for more ideas