First, I love that you put so many choices. They all look nice and bring something fresh.
I really like the look of #2. I always like to play with even more options, so this is what I thought, what if you used randomly, sparsely, some black little inset squares mixed with what you have in the pic? That way it pulls in the black from the borders but still blends with the top while adding a bit of variety to the little squares.
Did you decide yet which you like?