Since finishing Calliope's Odyssey, I've been hunting for other 2-colour patterns ... unfortunately most tend to be striped (not my thing) and many of the rest have solid blocks of colour that abut but don't really connect with each other (to my eye, anyway) ... Calliope worked for me because of that mosaic band that created a blending zone between two drastically different colours.
And yes, there's always the design-yer-own option. In theory. For someone who lacks mental visualization (such as m'self) that can be a rather frustrating challenge. We shall have to see if I can manage about five weeks with just me, my stitch dictionaries, and a LOT of paper.