Hehe! Here's a funny cartoon of Santa Claus hiding at the top of the Christmas tree to escape a very scary dog.
This one is very beautiful, it reminds me either of a very snow covered tree, a decoration made from icing or one of the vintage white plastic trees.
If you're looking for a very minimal but pretty image, this might be the one.. just the outline made out of little dots.
Another simple but bright and cheerful one, it's also available as a scalable vector graphic so it works very well for print media!
This beautiful image is very versatile since the background is transparent you can add whatever you want to the tree. It's quite large to!
This funny animation of a cat knocking over a Christmas tree is something many cat owners have probably had happen in real life... I did!
A white Christmas tree decorated with blue bows, ribbons and balls, animated with snow falling. Very pretty!
Here's a large image of a dark green Christmas tree decorated with colorful balls, popcorn strands and of course a star on top.
This is another large graphic, this time the tree is a bit brighter. Another very nice one for a greeting card perhaps since it's also available as a scalable vector graphic!
Here's an image of a beautiful snowy scene with mountains in the background, one of the trees is decorated with beautiful lights and holiday ornaments. Very pretty and peaceful!
Since Christmas is also about family, here's a nice graphic of a dad and his son out in the forest picking which tree they want this holiday season.
This may not be exactly a Xmas tree, but I put it here since it's covered with snow and looks very much like a white Christmas to me.
An angel sits on top of a Christmas tree that's covered with gingerbread men, snowmen and other festive decorations.