If you want I can talk to the BSides Orlando guy who made our badges last year. It was pretty dope; we used the same ATMEGA chip and added an LCD.
That would be cool. It was going to be AVR based anyway. I was thinking about using the Arduino bootloader to make it easier for people new to hardware stuff. I was also thinking about a more traditional LCD like 8 segmant, multiline. The pic you posted looks more like an OLED display, which would be cool, but as long as it is a serial interface.
Also, a BOM price point should be kept in mind too. I was thinking something like a mix between the Arduino Mini and Uno. Very mid sized and maybe at least a relay or MOSFET to switch mains voltage so we/everyone can hack lamps and other appliances.
OR, instead of a relay or MOSFET, have an eth interface. We could do like a crossthrough eth kinda thing, log packets on a hardware level with an SD card or something. That sounds more hackish and EZ kinda thing. Or USB crossthrough or something.