I'm one of those who won't put the tree up until either December 1st, or the first Saturday in December (depending on the year). But this year has been slightly hectic so the tree went up on Sunday (still in November!!!), but the decorations didn't make it on until the 1st.
In past years I've done catalogue-style trees and quite enjoyed them. But my favourite is definitely when I put all of the decorations I've been given on, and have a slightly crazy-looking, homey tree.
I love pulling each one out of the box and unwrapping them, and being reminded of who gave them to me and where I was at the time.