a lot of these (including the GT:NH sticker) are custom! i bought a bunch of A4-size vinyl sticker sheets like a year ago, and whenever something sticker-able occurs to me i just throw it in a big inkscape document. once the page is full i print it and just go to town with a box cutter :) most of the visible stickers are on one of these three sheets.

the debian and kde stickers are from freewear.org, and anything else is just random stuff i picked up from local orgs (hackspaces etc.) or from friends :)