What do the retainer designs look like at the orthodontists office?

I am getting my braces off January 22nd and I am dying to know what different designs for retainers they have at the orthodontists office? If anybody has had braces and can tell me what they designs are please let me know.

What do the retainer designs look like at the orthodontists office?
My ortho let me choose the color for my retainer. I also had one that glowed in the dark. I have a wire retainer glued in on the bottom, so nothing fancy there, but my top is pink :)
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