Baby Stuff: Car Seat Cover Question

My sweet, talented friend Summer (check out her talent on her blog: http://sumossweetstuff.blogspot.com/) is going to make me a car seat cover. So, this is the fabric I (actually, Stephen and I) picked out. Argyle will be on top, plain blue underneath:




As you can see, on the fabric there are a couple of button choices. I bought a bag of buttons that seemed to coordinate well with the fabric, but unfortunately there are very few that have two of each color and style of button. These are the ones that have enough, that I think look the best. Leave a comment on which one you think looks best to help me decide! :) Either the brown with the blue, brown with the green, or just brown by itself, or green by itself?

Here is an example of the style of the car seat cover:
(The buttons will go on the part that goes around the handle)



*Just as an FYI, in "real life" the colors of the fabric together, and buttons on top, all seem to coordinate/"match" better. ;)