With small children around its often not safe to have them lit. The possibilities are endless. Use a loop of Christmas ribbon as a hanger. Be sure to make the loop big enough to easily slip over the door knob. Attach a variety of object to the ribbon.
Bells are nice for the front door since they jingle when the door opens.
See my craft section for suggestions. I like to put a mini tree in my sons room, the kitchen and a larger bathroom. Besides having a mini tree in my sons room I also use Christmas window clings on his mirrored closet doors. Often as adults we tend to want to have a uniform more formal look to our decorating. Window clings also are a great accent on your bathroom mirrors.