I had the chance to play around with some basic case ideas, each with a different idea in mind. Most of these are big enough to exclude use in your pocket. If you are a fellow lover of cargo pockets though you still might be golden. ymmv

1) The Adafruit Special - Adafruit has some of the coolest boxes. Over the years I have collected the big and the small. This one pictured to the far left is the perfect size to fit all the works of the PiFold with a bit of room to spare. You can easily secure them to the inside of the box and make a small opening for easy recharging. Basic Black will go well in most handbags even for the most posh of events. It would also fit right in with a backpack filled with assorted Smiths and Bahaus cassettes.

2) The Gift That Keeps Giving - Post seasonal boxes, yeah we have a few. The one pictured in the middle front was a gift card box. The PiFold works fit snugly inside. Tape shut, add an external opening for recharging...instant awesomesauce gifting.

3) Duct Tape Wallet - Yes, I have a duct tape "problem". Middle Back is a quick nearly done wallet. All that is left is to secure pifold works inside, tape the sides leaving an opening for the recharger port aaaaaaand scene. In certain circles a duct tape wallet is still an object de rigueur.

4) Magic The Servering. These boxes can be found around our house even where they should not be. The PiFold works, the MtG instructions and some cards fit nicely in this box. Good for storing sideboards, dupes, tokens or even small d20/life counters while housing your PiFold. In certain settings it will go unnoticed.

5) The Anyfesto Tower Case - http://www.thingiverse.com/thing:725343 - Its big, its red, it has openings for both recharging and antenna as well as mounting options....it is the tower case I moded up for the Anyfesto project that PiFold spawned from. As it is it can easily house the PiFold works you could add a USB Hub, maybe a USB Sound dongle and speaker, a USB SDR dongle for use as a source to repeat, a much much larger battery for longer use...etc etc etc.

Given the compact size of the PiZero and needed components the possibilities for placement are vast.