I think the circle cloth pattern is easier to work in 2 colors, but I found that it isn't a "mindless pattern," one still has to pay a slight amount of attention. Once familiar with it though, it seems pretty intuitive. There are a few places where you have knit on a previously purled row, or purl on a knit row, and I would think, "wait a second, should I be doing this?" but a quick check with the pattern would confirm things.
The circles are offset from each other, row by row, and on my second cloth, almost done, I messed up and did two rows the same, but, it's just going to be a hot pad, so I'm going with it. I'll post pics later.