The Tree of Life is used as a symbol on many LDS temples. Sometimes the tree is realistically depicted. Other times a stylized version of the Tree of Life is used. The Oakland California Temple uses a stylized version of the Tree of Life that I really like. I have found this symbol in two prominent locations.
Each of the five towers of the Oakland Temple have the stylized Tree of Life pattern running up the middle of each of their four sides. Pictures of this are found in the following links: 1, 2, 3.
The same stylized version of the Tree of Life is found on the temple doors. You can see a picture of them here.
I like this symbol and especially this particular stylized version of it.