Growing up when my parents were together, there was always an angel with gold dress, wings and halo.
When they sepeated no idea what happened to it.
My dads tree had a silver star but now had a fredfo puppet on top instead 
My mum alternates her tree topper from a silver fairy with wand, a gold star, a red star.
Currently the last 3 years my tree has had a Santa tree topper, this year we bought a a red felt star instead.
A friend if mine has an alien facehugger as a tree topper, and someone I used to know once had a newspaper cut out of Zola (played for Chelsea once upon a time) on the top.
Strange!