Cloth badges. The sort you get in touristy areas mainly, you know, ‘keswick’, ‘the lake District’ etc. Started when i was a scout and it seems a shame to stop now as it makes a pretty good record of places I’ve been. Still sewing them onto the same blanket my grandad gave me.
Just about everywhere in france has them so have quite a few from uni summer holidays spent bumming around on the bike out there and you can usually find them in most places, just head for the shop most full of tourist tat.
My mum found an old swimming towel with my 50m etc badges on a few years back, they all dutifully got transferred over. Got a festive 500 and bear bones 200 last year as well!