Yesterday I went to IKEA looking for new Christmas things to decorate my home. I found this beautiful thing. You can place it like it's on the picture, but actually it's like a felt placemat with little lights and some Velcro on the edges. These allows to place two KALLTs together letting you make a wider cylinder which would be perfect to cover the downs of your Christmas tree. The rest of the year, you can use it as what it is,...lightning.
The links are to the Spanish Ikea site (here it's 12.95€), but just look for KALLT on your favourite Ikea Web.