I've been saving some pictures/patterns into my yahoo favorites when I came across them.
This one doesn't have a pattern but I loved the idea
http://friendship.quilt.to/tree_skirt_done_small.jpg
No pattern on this one either
http://images.google.com/imgres?imgurl=http://webstore.quiltropolis.net/stores_app/images/images_430/Dark%2520Green%2520Santas500.jpg&imgrefurl=
http://webstore.quiltropolis.net/sto...ZGmjteFVc9BUWM:&tbnh=133&tbnw=121&prev=/images%3Fq%3Dchistmas%2Btree%2Bskirts%26ndsp%3D21% 26hl%3Den%26rlz%3D1T4SUNA_enUS236US237%26sa%3DN%26 start%3D105%26um%3D1
Again, no pattern. Sorry (picture is at bottom of page)
http://images.google.com/imgres?imgurl=http://www.bonniehunterquiltmaker.com/images/tree%2520skirt%2520croped%2520resized.jpg&imgrefurl=
http://www.bonniehunterquiltmaker.co...bVDuuzj23opklM:&tbnh=116&tbnw=118&prev=/images%3Fq%3Dchistmas%2Btree%2Bskirts%26ndsp%3D21% 26hl%3Den%26rlz%3D1T4SUNA_enUS236US237%26sa%3DN%26 start%3D105%26um%3D1