This project on the ESP-09 would make for an awesome tiny WiFI enabled device, and if you make it an option to turn on the WiFi portion than it could be low power too. Perhaps logging data into memory then uploading in bursts, I wounder how long something like that could last on a battery?
This is the ESP-09 variant, only 1cm * 1cm
Someone used this with a 3.3v regulator strapped onto the back to control some WS2812b LED's (even though there's no antenna attached the author claims it still has a 4-10m range) : here
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