Every year in Seattle Washington there is a video game event "PAX Prime". And...at the event they give out cool free lanyards to the attendees! Here you can see one from 2013 (left) and 2012 (right) They're made of a slightly shiny, silky/smooth but tough material with all over printed designs.
The left is for Lost World which has the LW logo & a very tall 'slice' of scenery from the game, with Sonic at the bottom, all in CG art. The left is Sonic Adventure 2 Battle (yes they picked it in 2012) Its layout is pretty cool, with Sonic on one side of the strap & Shadow on the other, each bringing a different colored background & the logo is in the center.
Both of their key/card/whatever attachments are plain, it's just a simple hook on a sewn-in metal lead. These are uncommon because they are event-specific give-aways. Well made & stylish!
Discovered by SonicxAndxTails