Being somewhat of a collector/hoarder I can risk getting overwhelmed by my collections if I don't keep a handle on it.
I love elderly English bicycles and mostly prefer Hercules bicycles, but have others as well.
I collect bicycle licence plates and bicycle tyre repair kit tins.
I was into fantasy wargaming at one time and still have a huge High Elf army as well as a Goblin army. Mostly metal OOP model figures because I prefer them to plastic. I should really sell them all though because I don't seriously play anymore.
I did used to collect tinplate toys, - mostly railway/trainset. I've been slowly selling off my collection though as I need the money. I used to own large scale 'G' scale railway models too, but had to sell those when I first became ill and had lengthy problems with being able to get the Invalid's pension. Sometimes I will still make the occasional large scale railway model by hand if the mood takes me, but I no longer buy any commercially made models.
Lego; - I got into Lego (and Lego clone sets) after I had a bad relapse with this illness I have. It was a good way to get my hand/eye co-ordination and my brain working again. I own thousands of Lego bricks and parts, - far too many really. I build mostly railway related models (I come from a railway family so got the bug early).
I have fantasy wargaming armies composed of Lego and Megablok minifigs and Playmobil 'klickies' too which are fun and I much prefer them to my serious wargaming models.
Tools; I like tools, especially old tools. I don't like working with power tools much so old handtools are something I really like. I don't have anything like the tool collection I used to own when I was still a truck mechanic, but I have enough to do whatever I want to do out in my workshop.