For the holidays you can spend time trying to find an ornament you like or you can just make one yourself. I'm a fan of geometric patterns myself and am kinda tired of snowflakes so it's a lot easier to just design my own to be 3D printed. Even if you don't have your own 3D printer (I don't have one myself) it's easy to send files out to be printed elsewhere like at 3dcreationsystems.com. They're the ones that printed this one.
As for how to make the design, you can do it yourself with free online software. I used 123D Design to make this one. Here's how.
Step 1: Start With a Circle
This is a really short tube. 35mm wide, 3mm tall, and 3mm thick.