One of my favorite iPhone accessories, the clip-on lens kit Olloclip, just got a spiffy new white version that should match up with your lighter shade of iPhone nicely.
The Olloclip, if you’re unfamiliar, is a clip that attaches to the corner of your iPhone and allows you to shoot through a macro, wide-angle or fisheye attachment. As a heavy iPhoneographer, I’ve found the thing to be pretty much indispensable. For more info about the Olloclip, be sure to check out my detailed review from late last year, it’s got a bunch of sample images and impressions. The tl;dr is that I really liked it and still do.