It used to be books...until I realized that I had no room for clothes, cause the books were everywhere! I had to cull them and only keep my favourites. :(
These days, I have a lovely collection of DVDs (mostly TV shows from my youth - I buy them from Amazon with the GCs and give them to my Mom (used to be my Dad too) and we watch them together to remember fun times) where I once had books.
My current obsessions are pearls and semi-precious gemstones. I took up jewelry making a few years ago (my neighbour held a workshop & I got hooked), and now my friends get pretty shiny things on their b-days. There is one website that keeps having these darned sales that are too hard to pass up. Right now, they have a strand of pearls on sale for less than $1 and even with the exchange rate & customs, it's still far less than what I can find locally (a strand runs about $5 and with less selection than I can get online). As for gemstones, I have a soft spot for rose quartz and amethyst, although garnet (my birthstone) will also catch my eye.
I started off with a small box of findings. Then a few boxes which fit into a cloth reusable bag. I now have 2 shelving units full of items. We won't mention the jewelry boxes full of creations (thankfully, I have lots of friends & family to give my creations to, or I'd have enough baubles to wear a new one each day for a year or more :embarassed:).