She's fairly traditional so went with a cake covered with longevity symbols. The symbol itself, the longevity peaches, and the God of Longevity himself, sitting atop the cake. I ran into trouble with the painting of the fondant covering the cake though.
I had wanted to do a nice shimmering gold color but when it came to brushing it on, it came out in patches. I ended up using some water and using the brush strokes to create the textured effect instead which actually turned out quite well.