Defyant, mate those cases look awesome!
As for my collections, I have 2 loves that I'll never own enough of...
1. Stubbie holders. Whenever I go on holiday I try and get some souveneir stubby holders of places I've been. Small towns, tourist attractions, cool shops, just that I've enjoyed on my trip. Rellies have jumped on the bandwagon too and started buying me ones they think I'll like, funny ones, brands, sport teams, etc. They take pride of place atop my grog cabinet, along with other grog related collectables - souveneir wine/shot glasses, a Stones Original ceramic decanter, etc.
2. Vinyl records. It all came from my DJing. It started with dance records, mostly hard tech and trance stuff that I couldn't get from DJ mp3 stores. Then I started buying a lot of new hard stuff because at the time I could buy the vinyl a couple months earlier than the download. I inherited my folks old vinyl collections from their teenage years when I started playing weddings, and so now I just buy anything. I don't really trawl for classics or rarities or whatever. If I see anything at a market or garage sale that could have some old gems or wedding favourites on it I'll grab it. At 50c for an LP, its a buttload cheaper than iTunes, and half that old 70s and 80s stuff isn't on there anyway, or you just never think of it until it pops up on a record. I have thrown some big dollars at some hard dance whitelabels in the past though - on a few occasions I've forked out over $50 for a record with just 1 song on it, because I freaking loved those tunes and they're hard as hell to get hold of! I don't think I'll stop buying records till the wall in my studio looks like this...
(Disclaimer: That's neither me nor my house. I just found it on Google.)
(Edit: WTF, why does this image keep reverting to its original size every time I shrink it and save?!! )