My wife's family always had an angel at the top, so once we got married we decided to keep that tradition and get an angel for our tree. The one we have now looks similar to the one below and has LED lights inside that change:
My family had an angel for years that my grandmother had bought. It slowly started breaking so we eventually got a Mickey Mouse topper that swings a lantern. And now my parent's use a star topper that I bought when I was in college.