Gorgeous fabrics!
I haven't seen the particular instructions for DWR that you are referring to, but if it were mine to do, I would use the second fabric in the stack as the 'background', and the bottom one as the 'corners' (the parts where the rings interlock).
I think I would add a few more fabrics to the mix, but I grew up with one that had probably 9 or 10 segments to each ring and it was very scrappy...no two rings exactly alike, although all the fabrics were used in several rings.
edited to add:
BTW you really need to do 4 blocks to get a full view of what it looks like put together