This is how my project turned out:
So, guess what I used for the fob? This thing!
As you can see from the picture above, it's a rolling shutter rope, in cotton and nylon. I burned the cuts, so everything stays in place. I'm not 100% satisfied with that, 'cause the cotton part tends to darken when burned... but you almost don't see that.
Being the first try and all, I do like it and I plan on making some more, maybe with a different method.
Could be useful finding the right hardware, though... anyone knows where I can buy online?