Mine is Bears and Tigers, and now since we redecorated our house its western stuff like horses, cowboy stuff, etc.
everyone in my family collects something different so its fun watching to see what you can find to add to their collections. my moms is owls, my baby sister is cats and mickey mouse. My other sister is angels, my brother in law is lighthouses. my brother is wizards and dragons. Granny likes crosses, angels, etc. my pa's would be yellow cats. Then there is confederate flag stuff that is popular with Roman, myself and my brother.
I collect Dumbo items for our daughter because I came home shortly after the Loma Prieta earthquake occurred. Jenny, 3, and her nanny were watching the Dumbo movie. Nothing was damaged in the quake and the nanny did the correct things.
After that, it was Dumbo, Dumbo, Dumbo things, mostly for Jenny but sometimes for me, too.
I don't really collect anything. Love music boxes and stained glass and bottles of colored glass. The music boxes and stained glass are out of my budget but I have several of the bottles
Years ago, I used to collect unicorns...but they've been packed away for ages. People like to give me cat things, but I've never specifically 'collected' them.