Looking at things in nature can be a very relaxing and calming experience, and the same goes for Pocket PC themes.
This Tree Theme features a (heavily Photoshopped) background image of a tree in a field. Behind it are rolling hills and a cloud-filled sky. It's a nice enough image and on its own could make you feel at peace.
Unfortunately the creator of the Tree Theme has gone and ruined the tranquility by plastering a garish bright purple color in the status bars that above and below the image on the Today screen. This completely contrasts with the image, whereas a dark blue or gray color could've really complemented it.
As a result, Tree Theme is yet another example of a Pocket PC skin where a nice image is spoiled by a poor color scheme.