The elf in question is a character from a children's book, which tells the story of how Santa sent an elf to every home to spy on children and report back whether they had been 'naughty' or 'nice'.
We asked the HuffPost UK Parents community to share their best 'elf on the shelf' creations they've come up with in the past.
Browse through the tweets and click through the slideshow below to give you a bit of inspiration.
— Lucy Anne Pritchard (@Noisy_Smurf) December 3, 2015
— Ruth (@shoe_smurf) December 3, 2015
Click through the slideshow below to see the rest of the ideas parents submitted.
Want some inspiration for the 1 December? Here are 15 ideas to get you started (you're welcome!).