How about something like this? The hunter star block is 9", the red around each block is .25", and the sashing is 3".
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I put the blue border as a 3" sashing because I thought that a 3 inch border around each block (which equals a 6" sashing) would sort of overwhelm the 9" blocks, even if you did put the red inbetween each border.
If you sew this up, I recommend sewing the block first, then your 1/4" red border, then a 1.5" blue border around each block. Then sew your blocks together in rows. This is much, much easier than trying to line up long sashing strips