I must admit that I don't really collect anything. With my husband having Obsessive Compulsive Disorder (OCD) I cannot leave things around the house to gather dust and make more work for him. He cleans the house obsessively, infact the hoover is never put away, as he hoovers at least three times a day, having to do each room in a specific order! Under these restraints it's hard to collect items as I, like anyone else, would prefer my collection to be on show so that I could enjoy it.
But thinking more about this theme, I realised I do collect one thing, and that is Yankee Candles. I love their fragrances and often burn a candle whilst I'm crafting. My husband doesn't like candles, but knowing I like them so much, he does actually buy them for me sometimes.
I keep them, yes, in a cupboard, which smells gorgeous when I open it! I have just two candles on display. They are in the Lounge because they each have a tray and matching shade and are therefore decorative and 'acceptable' to Hubby. The rest are hidden away in the cupboard. I think I have over twenty candles of varying sizes and perfumes, and because I use them up, it's an ever-changing collection and will never be 'complete'.