Decorating a baby onesie. Need creative help!?

As my husband has been working out of town for the last month, my little one and I haven't seen him since! We're flying out to see him for the 4th and I'm going to make my little man a onesie to wear on the plane so his dad will see it when he picks us up. I need something creative and cute to put on it. Our baby is 2 months old and my husband owns a drywall business if that helps. Any suggestions would be great!