I have several collections. I collect Sabino glass. It's glass that has gold in it and it is white with opalescent colors all through it. I have several birds, butterflies, and perfume bottles. It's very expensive so I only buy one every once in a while. Here's a link so you can look at one.
http://cgi.ebay.com/Sabino-Art-Glass...QQcmdZViewItem
I also collect Hallmark Christmas ornaments. This collection is one that my husband hates. It takes a lot of room to store the ornaments and the boxes, but I just love decorating for Christmas and getting them all out (which takes forever!!!). My tree is always very, very decorated. I play a little game with my grandchildren after the tree is decorated. Our tree stand makes the tree turn around so I ask the kids to find certain ornaments. Kind of a search and find. Everyone always has their favorites.
I also collect antique children's toys. I have several oak cabinets from the early 1900's filled with little kitchen things and I have a little laundry set with a clothes line, wringer washer, little iron, and even clothes pins. I also have a couple of miniature oak dressers. I just finished an antique children's dish set (I love e-Bay!!!) and I also have several other dish sets.
I probably have a few other collections but these are the main ones. I love going to flea markets and garage sales but I get a lot of stuff from e-bay.