That's a really neat layout for log cabin blocks. I had an idea for your border, and mocked it up in EQ7. I kinda like it, but it might be a little too busy?
[ATTACH=CONFIG]511964[/ATTACH]
Without the inner (yellow) border:
[ATTACH=CONFIG]511965[/ATTACH]
With a different color in the corners:
[ATTACH=CONFIG]511966[/ATTACH]