There are quite a few stamp sets in the Stampin' Up! catalogue which have trees depicted on them. At this time of year, tree's are great for cards with an autumn feel, like this swap that a fellow demonstrator gave to me at our last training day. It uses one of the trees from the Lovely as a Tree stampset, which I keep thinking I should invest in as these seems to feature on so many cards.
The card base is Cajun Craze from the Regals colour range, stamped with the oak leaf image from the Lovely as a Tree set in both Soft Suede and Cajun Craze ink. The main image has been inked with Soft Suede and stamped onto Very Vanilla and them mounted on matching card stock.
The sentiment is from the Clearly for You stampset and has been inked to match the image and then punched with the Jewelry tag punch, as has the leaf image (also from the Lovely as a Tree stampset), and both tags have been tied with linen thread.
Another stampset with a tree image is the Easy Events set, which I just love for the numerous images included that can be used for all and any occasion. Here is the tree, used on one of the note cards shown here.
I would love to see any ideas or projects that you have made which use other Stampin' Up! stampsets with tree's in them...