This is on sale, I have not tested this design yet although I cannot think why it wouldn't work.
This iPhone 5 case holds 2 personalised messages engraved into the case over the top of each other, each message is only visible when viewing the case from an angle, 45 degrees up (for the first message) or 45 degrees down (for the second message). This produces an effect similar to those bumpy textured animated cards that animate when you tilt the card.
This is achieved by extruding each message at a different angle onto the case in a grid like format.
This example shows the text 'Dual Message' as the First Message and 'iPhone 5 Case' as the second message' however I can imagine this working particularly well with 2 names making this case a good gift.