Here is where I started. I knew I wanted those particular fabrics in the corners. I also knew I wanted to use the big yellow triangles. I tried dark blue or light lavender pieces to go with the big yellow triangles and decided the dark blue ones worked better because the lavender was just too light. The green on the bottom didn't work either because it just wasn't enough contrast from the other pieces.
At one point I did consider flipping the blue points outwards. I decided I wanted to see the star more and switched it back. I also like this center as I think it brings out the darker part of the yellow triangles.
You can see below that I added a little darker green micro triangles to the center. I like how they help your eye flow out to the lighter green squares.
I hope you get to quilt today!