Just because you're getting a bargain on your jewelry, doesn't mean you can't get something unique and lovely. You can get estate bargain jewelry that really stands out in a crowd. Estate pieces are usually characterized by elegant details like filigree or deco styles with bold animal shapes and sinuous curves.
You don't have to get a modern design if it doesn't appeal to you and you don't have to pay full price for something unique. Just look around and be patient - the right piece will present itself if you persevere.