I really do love that brown color, though. After reading that the oils from your hand will gradually season the richlite and cause it to darken, I went straight for the walnut oil (no mineral oil allowed in my place) which is what I use on my cutting boards and rubbed it in by hand, which caused it to darken beautifully. I've taken the case off and given it another coat of oil, then took another picture. In natural light, the whole thing looks even darker than at the edges of the photo - keep in mind I've got fluorescents on in the background and put the flash on to highlight everything.
The camera on my phone is much better than the macbook.
I'm eventually going to get another iPhone... 5S or 6, we'll see. But if Twig ever offers side engraving, I'd want one done just that way, but with a plain back. More grip, but space on the backside to write notes in chalk or pencil. Could be fun.