Congrats! What an honor!! You guys deserve it.
I am inclined to agree with others about avoiding the colors already done by NINO and LLL. Go with something different that will make yours stand apart from others. While pink would certainly work for me right now because I have a girl, as someone already said, I don't think I would want to put a boy in pink and DH's wouldn't want to wear pink. Go with something that moms and dads would wear and would work for boy or girl...you want to be able to get those ATB Didys on as many babywearers as you can!! 
Here are a few ideas off the top of my head and I will keep thinking...
natural, light tan color with the logo in a darker brown
silvery gray with logo in black
black with logo in purple
Okay...once I posted this I realized that I don't know if they could do a solid color with the logo a different color??? Is that possible? Or would it have to be all the same color like the NINO ones?