how do you mean about the borders? What i see is you alternating your nine patches in each row, but usually when this is done, the beginning of each row is usually done alternate too, but you have every row the same. Is that the look you are going for? Or more of a criss cross pattern, if you want criss cross, you have a nd b blocks.
Row 1 ababababa
row 2 babababab
row 3 ababababa
but what you are doing is this
abababa
abababa
Is this intentional? if so it looks great either way, i love the colours!