Any tips for decorating? + search in level editor?

[FlawlessHappiness]

Also think realistic and think: If that happened, what would that do to the floor, walls, ceiling, etc.

As andyrockin123 said if you have a hole in the ceiling, then debris and water on the floor.
If a bookshelf has fallen, then books and paper will be on the floor beneath it.
If water has been dripping there may be plants growing