I was thinking (I know, steady on!), there is no reason you couldn't use the Campervan Egg Cosy Pattern to make some Festive Dub Decorations for your Christmas tree.
Why not sew a bell inside to add a festive touch ;)
Maybe you could fill them with some kind of Christmas scented pot pourri and stitch a felt base on them, or even better, fill them with small sweets and sew in a paper base as a treat for the kids (unless they are liquor chocolates in which case back off kids, they're mine!).
If you decide to give it a go I'd love to see some photos - just send me an email - email@example.com
Campervan Egg Cosy (or Christmas Decoration!) Pattern available at Etsy.com