Well it shouldn't be a completely random patchwork if assembled correctly! For the current upload, the main earth and sea tessellations should each join neatly at the sides with just the base-plate (and handles) being different per layer. What you're really telling me is that I have a future in obsessive or comedic(?) instruction-writing though. ;-)
Oh good, another mathematical design in the contest (not that I'd expect anything less from you, Sef!) These are the sorts of designs I loved coloring as a child, where I could choose what I wanted to bring out; where my sister and I could start with the same page and end up with very different results depending on what symmetries we picked up on. And I love how you made the flowers come apart at the 'peaks' and join together in the troughs - filling in with extra centers - makes for a lovely joining of the spirals.