Not sure if these would be too expensive, but I found these stamped cross stitch tree skirts on eBay (ordered from least expensive up):
http://www.ebay.com/sch/i.html?_from...stitch&_sop=15
Edit: Searching for iron-on transfer patterns for Christmas, I found the following:
http://www.123stitch.com/cgi-perl/abcSearch/search.cgi
Note: The link goes only to the website. Then you need to go into "Cross Stitch Subjects" at top and then search within that category for "Christmas" and/or "Stamped". There may be other ways to search that website for the types of patterns you are looking for.
Edit 2: Try searching the entire website for "stamped cross stitch Christmas".