This one you could any fabric and embelish it with ribbon etc...
http://www.sewing.org/html/tree_skirt.html
This one is more work, but would showcase your fabric.
http://www.mccallsquilting.com/patte....html?idx=7209
This one is kind of cute.
http://crafts.lovetoknow.com/wiki/Se...mas_Tree_Skirt
I think I might make this one for my sister.
http://www.bomquilts.com/Christmas/P...rt-Pattern.pdf
Another
http://bomquilts.com/images/treeskir...sTreeSkirt.pdf
Here are several, including one with fleece that is kind of cute.
http://tlc.howstuffworks.com/family/...corations3.htm
This is kind of creative using cheap table runners.
http://www.annthegran.com/cs/blogs/s...e-runners.aspx
That should give you some places to check out.
Have fun!