Technically Apple only allows black iPhones for use in third party app marketing. In my experience it is only really enforced if you are trying to be featured by them.
"Feature only the most current Apple products in the following finishes or colors: iPhone 5s in silver or space gray, iPhone 5c in white or blue, iPad Air in silver or space gray, and iPad mini in silver or space gray. If multiple Apple products are shown, display them in the correct relative sizes."
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[ 2.0 ms ] story [ 22.3 ms ] thread"Feature only the most current Apple products in the following finishes or colors: iPhone 5s in silver or space gray, iPhone 5c in white or blue, iPad Air in silver or space gray, and iPad mini in silver or space gray. If multiple Apple products are shown, display them in the correct relative sizes."
http://9to5mac.com/2013/10/31/apple-to-devs-gold-iphone-not-...