Topics created by Tree

Which USB NFC Card reader? There are thousands on the market :P

RE Apple stuff, I don't have an opinion. What about third party NFC add ons though? Flomio for example?

You can use an arduino or raspberry pi based solution to read/Write and otherwise utilise the ring. You can also get NFC door locks that don't require you to program the ring before use.
There's a whole world of things out there that don't require a phone or tablet.

It's probably not possible to have the image come onto the phone as a wallpaper, the image has to be on the phone in the first instance. However if the images were on the phone it is possible for the ring to trigger a change in wallpaper. I use hdim detect in one app to trigger tasker to change another app that can change live wallpapers or normal wallpaper.
The ring itself probably cannot store enough data for a wallpaper image.
However you could use the ring to take your self to a URL that could have that image on it, but for it to happen seamlessly on a random phone could be tricky.
I would think a particular phone that was set-up right would be the best option.