These ceramic trees were everywhere in the '60s and '70s. If you still have one, it could be worth hundreds. 

If you still have one in storage, you could easily flip it for some good money. The only catch is that you need to do it during the holiday season. Once December 26th rolls around, the demand, and price plummets.

One of these just went for $650 on Ebay and many others are being priced at a couple of hundred bucks.

Mental Floss has a good idea if you don't have one and want to cash in next year.

If you misplaced your ceramic Christmas trees years ago, there's still a way to cash in on the trend. Wait for the holiday season to pass then snatch up the items from other sellers at online auctions and flea markets for a low price. Then come Christmastime next year, they may earn you enough money to give a boost to your gift budget.

My parents have one that's been sitting in the closet for about 20 years. I wonder if they'll miss it when it's gone.