The short answer is YES. There is a market for almost everything these days. Thanks to the internet, most of the 7 + billion people on this planet can reach each other in one form or another. There are a zillion platforms for reaching your potential buyer, and with the right search words, the person that wants your homemade reindeer ornaments from the 1980s can be found!
Having said that - there are a few types of ornaments that are more popular than others.
Really old ornaments
If you can prove your ornaments are really old, say early 1900s or even 1800s, then there is definitely a market that would be interested. These are most often handmade or produced in short quantity so having them would be rare indeed.
Most of us are likely to come across more recent "vintage" ornaments. The 1980s are really hot right now, especially the brassy mid-century modern retro decor that flooded the 80s. Recognizable characters like the peanuts or new kids on the block are sure to find an audience. Heavy metal bands - big gaudy ball ornaments and handmade decoupage are all classics.
Here are a few examples of top sellers on ebay:
Blown glass is always popular - but be careful, they break easily
Classic ball ornaments - great sellers.
How about these crazy reindeer?
There are so many other fun vintage ornaments out there. Lots of handmade options - like cross stitch, hand sewn, hand painted, beaded candy canes and more. If you are in doubt - run a search on ebay and you are sure to find what you're looking for.