I like #4. I would also be interested in seeing it with the blue and green reversed -- the sashing green and the triangles blue. And I wonder about a little brighter gold - almost a yellow. There are lots of true yellow leaves around here in the fall as well as some that are almost a true red. There are always some that stay green until they just die and fall off and your blue represents the sky. With the hues of yellow, gold, orange, rust, red, purple, along with brown, gray and near white tree trunks that occur in nature, plus the blue sky, it would be hard to have too much color in a fall quilt!!