Making a Walnut Guest WiFi Coaster
I thought this would be a good gift idea, so I bought some NFC tags on eBay, and then built a coaster around it using walnut and sand blasted glass.
The main thing for building one of these is getting some NFS tags, which you can easily find on Amazon, and writing your WiFi credentials to it as an NDEF record, which is possible using various phone apps, including the TagWritter app from NXP, which is surprisingly good for being a vendor app.