My idea is to embed a Qi charging receiver in the foot of a plushie. I'm trying a ZigZagoon for starters. Qi charging stations are everywhere now: I even have a desk with one built-in (see the picture).
The Qi receiver will power a low-energy bluetooth arduino, speaker, and a servo or two. Paired with a nearby computer or phone, and configured with IFTT, the ZigZagoon will growl or move to alert me to different things.
Current Status: I just got an AdaFruit "Universal Qi Wireless Receiver Module", and am going to test its output and see how well it fits into the plushie.