You can get those plastic fry basket/plates that you then line with cute paper! They’re usually oval but I’ve seen plate-shaped ones at both restaurant supply stores and a local discount grocer. Super easy and feels fun Amazon link
If you want really cheap...
Not an actual banneton, not quite as much support as a real one, but I've used these for years and they do the trick. Also come in ovals.
This may well be a Christmas themed "plate cover". To keep your plate insulated whilst you wait for everyone to get to the table....like the one here: http://www.oriental-embroidery.com/oriental/store/published/publicdata/ORIENTALOSTORE/attachments/SC/products_pictures/045_1000x750_thm.jpg
Like this (but Christmas themed):? https://www.amazon.com/Bun-Warmer-Insulated-Bread-Basket/dp/B004VR0IQY/ref=sr_1_19?ie=UTF8&qid=1482661279&sr=8-19-spons&keywords=bread+plate+warmer&psc=1
EDIT-Because of there relatively small size...maybe just for a dinner roll plate?