Tree.app 1.0 (by BuyIcons.com)
Tree.

Mail Fixer 1.1 (by BuyIcons.com)
Mail Fixer is a free utility to change the appearance of Apple Mail 2.

Tree.app 1.0 (by BuyIcons.com)
Tree.

Winter Holidays Icons 1.0 (by IconDrawer)
Winter Holidays Icons is a set of 7 winter holiday icons representing things like snow man, Christmas tree, candy cane and more.

Christi's Tree 2.2 (by YourHead Software)
Christi's Tree is simply a Christmas Tree for your Mac.

TreetopLights 2.2 (by Kevin Kelleher)
TreetopLights is an AppleScript Studio application that places a Christmas tree on the desktop and holiday lights on the menubar or screen edges.

3D Christmas Cookies 1.0 (by MacIntoshScreenSavers.com)
elightful 3D Christmas Cookies float against a snowy sky as "We Wish You A Merry Christmas" plays in the background.

X-MasTree 1.4 (by John Schilling)
X-MasTree is a small (or medium, or large) floating Christmas tree for your desktop.

Christmas Tree Creator 2.0 (by Fishback Research)
Christmas Tree Creator software is an easy-to-use application for designing Christmas trees with drag-and-drop ornaments and animated lights.

Snow Desktop Animation 1.1 (by Rick Jansen)
Snow is a Christmas desktop animation where Santa flies around your screen was his reindeer.

3D Halloween Christmas 1.0 (by MacIntoshScreenSavers.com)
Skeleton Santa and Jack-O-Lantern Snowman dance around a "Christmas tree" as jack-o-lantern "snow" falls.

B-Tree 1.0 (by Sperling Corporation)
B-Tree is an educational tool for showing the operations of a B-Tree.

Powder 1.0.2 (by Sphera Software)
Powder displays beautiful, interactive winter scenes on your desktop.

EarthDesk 5.0.6 (by Xeric Design, Ltd.)
EarthDesk replaces your static desktop picture with ever-changing, beautiful maps of the world with correct sun and moon illumination.

Tree.app 1.0 (by BuyIcons.com)
Tree.

MVDesigns Desktop Pictures 3 1.0 (by MVDesigns)
MVDesigns Desktop Pictures Vol.

MVDesigns Desktop Pictures 2 1.0 (by MVDesigns)
MVDesigns Desktop Pictures is a collection of 28 desktop pictures with a wide variety of textures and patterns.