I like this but there is probably too much contrast for most people.
This is easier on the eyes.
Not so good. The black strips are unattached and floating. They look out of place.
This is better.
What if I put dark sashing strips by the dark half of the Log Cabin block, and light strips by the light half?
All the versions are very similar but I think I like this one best.
For more sashing ideas go to My Posts by Subject in the sidebar on the right and click on Sashing.
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