Thank you CaliAnn, Donna, sno, and Terri!
The way we have come to work it out is that one of us start on 1/8 to about 1/2 the paper, or somewhere about a quarter of the paper and then hand it off to the other to finish. In this one, they started it and I ran with it, at first with their basic palette, but came to add a number of other colors after we checked in together when I was about half-way through with it.
I have some not-so-great images of the transformation. This was how it was handed off to me:
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I took it here at first:
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Then to this:
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Then finally:
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Then I started this one for them that they just finished:
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I'll post a pic of how they finished it soon.
And yes, we do have a theme that we have been discussing, but it's a loose theme since we are not approaching it too literally as we are working in abstract. It has to do with the landscape as a form of a temple, or a protective house, but there's a lot more to it than that. That's the gist though. We have a lot in common, so we are also addressing/celebrating our commonalities.