I too like the "S" shape plan with the darker blocks. It breaks up the space better. For some reason in design, things with odd numbers always look better. So three, five, seven, etc., rather than two, four, etc. This works with flower arranging and areas in a photo or a quilt top. When I first looked at your #4, I got a feeling the sideways brown V was dividing the space in half. So therefore the S shape will divide the space up more.