Old matchbox labels. I try and get a full set in a series, which is maybe 10 designs, then frame them - not really a collection in some senses I guess but erm, it sparks my interest enough.
Not at home so don’t have them to hand but I’ve got a full set of Soviet space ones for example from the 60s. They are often very cheap.
A couple of semaphore signals with spectacles and lenses are mounted in the garage, a semaphore shunt dummy, class 25 cab desk and various bits that were liberated from the skip at work from class 313s are in a box in the garage, including a guards panel from a 313.
To much annoyance of the wife I have a class 37 speedo on display in the bedroom along with a fair few original posters framed and on the wall which are my favourite, including an original 80s InterCity sleeper poster.
Would it be something like this? Not sure if you were thinking of this or an earlier one.
It’s described as a kit and I don’t know whether or not the company selling this is still active as their website looks quite old, but if you search for Little Bus Company you could try them.