Those blocks are gorgeous - the fabrics are lovely. It really depends on what colour you want your finished to be quilt to be because it will take on the joining strip colour. On a Queen size quilt there will be alot of joining strips and their colour will be very obvious. So if you use the blue polka dot the finished quilt will "read" as a blue quilt as it will bring forward all the blues in the fabrics. Similarly with the pink, burgandy or green. To keep the interest of the variety of the fabrics I would suggest a white on white. I look forward to seeing a picture of your new quilt on your bed and what ever you decide I'm sure it will be stunning.