The NFC tags seemed to be of interest, so I called the place I bought them from and bought a few more. open to suggestions for what to do with them, either next year at #defcon or something else ¯\_(ツ)_/¯
These are writable NFC chips. I wrote the URL of my profile here to a bunch of them, and have been handing them out at #defcon. If you got one and don't know what to do with it now, I have been using "NFC Tools" for Android to rewrite them.
If you want some and you're at #defcon, let me know