Well CONGRATS! To your Wife! She held out long enough! This is going to be so cool for your family. Facetime is going to be fun for you guys. I haven't used it yet because my Hubby doesn't have the iPhone 4. He can get it in February at a discounted price but I suggested that he wait until the Summer when the iPhone 5 will be out and then he can still get it at the discounted price. It's a shame because he could have been enjoying this iPhone 4 beauty but I think the iPhone 5 is going to be awesome and worth the wait for him.
Your wife, waited long enough. There are lots of ways she can transform that phone in to a "White" iPhone now. There are vinyl stickers she can buy to cover the whole phone to make it white just like what the original White iPhone 4 looks like.
A good way to do it is get a set of vinyl stickers for the phone and use only the front ones including the home button and get one of those snap on aftermarket cases from ebay that covers the back of the phone in white and the sides are clear. The white back looks just like the original White iPhone 4 back and its a parlor trick, but it might satisfy her quench for a white phone.