Year
Hacker conference badges documented for 2010, sorted by country.
ATmega88 USB-bootloader rabbit badge
A source-backed record for the eHaserl, the Easterhegg 2010 surprise badge from the Munich Chaos Computer Club, with official assembly notes, flashing instructions, errata, and a badge talk.
Lithographed aluminum e-paper-style badge
A DEF CON 18 electronic badge built as polished hackable jewelry: lithographed aluminum, a low-power 128x32 Kent Displays cholesteric display, USB connectivity, role variants, and published badge-making materials.