This is going to be fabulous. I am always intrigued by creating a kaleidoscope effect with fabric and doing it with border prints really adds some extra pizzazz. How much yardage of border fabrics do you buy for a project like this? Or did you purchase them to use as borders?
The few that I have in my stash (all of 3!) one I have set aside to use as the border for a project and I bought enough yardage to cut it LOF but the other I picked up to do some experimenting like this and only have a couple yards of that. The 3rd one I picked up at an estate sale so only have one yard of it and my plan for that one is to cut it like you did for a some centers in MC stars.
There are some gorgeous border prints out there, especially Jenny Beyer as she also likes to use them for piecing. I look forward to watching your progress on this very ambitious and inspiring project.