Well Ducky, I was thinking to match the green color (the darker green) in the center...so not a really dark one..but you get that little whirly ducky thinking cap situated on your little head (I keep seeing a little beanie with a propeller on the top) and I know you will figure out just the right thing :D:
Editted to say...hmmm, who says the sizing border has to be a solid? what about something more similar to the floral print in the center or something along those lines?