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We're going to make hats that are IoT nodes! They will have IR senders/receivers aiming forwards and backwards. Wearers can "battle" each other to gain/remove points. Leds will display the current point total of each hat wearer. of course, each hat is an ipv6 node that can be queried and manipulated over the internets!
The JN5168 is a neat little microcontroller. It's a 32Mhz 32-bit (Openrisc 1000 derived core) with 256kB/32kB/4kB (Flash/RAM/EEPROM) and radio. Jennic (bought by NXP) has an rtos and ip stack they give out and toolchain.
Seeed Studio has fortunately taken one of these modules and made an XBee footprint module! They call it a meshbee. Out of the box, meshbee's have FW installed that makes them Xbee like, designed to be worked with an external microcontroller. In other words, in their model, the 32-bit core is a peripheral of the 8-bit core. Of course, this FW can be rewritten to suite an IoH purpose.
To see how to get up and running, see GettingStarted.
http://www.seeedstudio.com/wiki/Mesh_Bee https://www.sparkfun.com/products/11812 http://www.nxp.com/products/microcontrollers/wireless_microcontrollers/JN5168.html http://www.nxp.com/techzones/wireless-connectivity/jennet-ip.html https://github.com/pscholl/contiki-jn51xx