I'm not much into collecting, but I have managed to come up with a couple of collections over the past number of years.
Over most of the past 10 years, I have had the opportunity to work at a bunch of large events. I've kept all of my badges and lanyards.
I've also spent a lot of nights in hotel rooms. This stack of hotel keys represents those nights.
This one is a little different. I've had a Dilbert Desktop Calendar on my desk for a lot of years. Here's the last 9 years. Number ten is currently collecting on my desk.