Forget Daydream: here's a Google Cardboard viewer you can actually eat
Envisioned as something of a gingerbread Cardboard, the viewer's constructed out of overlapping segments of graham cracker panels, cemented together with the help of some icing.
Now, full disclosure: this Cardboard viewer isn't quite 100% edible, as it still employs standard plastic lenses. Could you theoretically craft some optically transparent, edible lenses of your own? Probably, but not without a ton of time and effort that could otherwise be spent building, using, and consuming this 95% edible VR viewer.
Practical? Oh, heavens no. But we can't deny that this project both looks like a lot of fun, and is straightforward enough that you could likely pull it off yourself without a huge amount of difficulty. Granted, you'd probably end up with a lot of broken graham crackers and spent icing in the process, but cleaning up after yourself (especially if you get to eat your failures) is half the fun.
source: Make via Boing Boing