Strip Twist Borders

The strip twists are all sewn together.  I'm working on borders and backing.  Of course the quilt is telling me to change my plans.  I'm thinking two inches for the inner border, three inches for the outer.  Always planned to bind in the green and now I'm thinking of doing a flange binding with a little yellow?  That idea came out of nowhere but it's stuck in my head.  I've only done flange bindings on wall quilts. 

I plan on cutting the green borders in one piece along the grain (so no center seams).  But that makes for short crossgrain binding pieces.  Looks like I can make binding along the grain - I've not done that before. Or cut binding pieces on the bias? 

Then there's the backing!  I had planned a solid back and now I'm considering piecing some of it together.  Wonder what this quilt will tell me to do next?

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