This week I'm working on custom code for the SMART Response XE classroom communicator. It's based on an ATMega128RFA1 which has a built in ZigBee transceiver, 384x136x2-bpp LCD and full keyboard. These are available used on eBay. They were discontinued several years ago, but are an interesting device for the price they're selling for (~$10 each). I've written a support library which allows using the LCD and keyboard. One of my first project ideas is to write a wired and wireless VT100 terminal.
Here's my github library: SMART Response library