I do traditional in the living room, red, green and gold baubles and wooden toy decorations, strings of beads and baubles over the fireplace too.
In the dining room / kitchen I have a tree with gingerbread men, candy canes, cookie cutters, wooden spoons and gingham bows... And garland across the chimney breast in there of gingerbread men on gingham string.
I change the playroom every year according to what toys my DD's are playing with... When DD1 was born I decorated the tree with all the bunny snugglies and loads of pink decorations, the year after I put Lamaze toys on it, the year after I put all the toy story characters on it / in it / poking out of it, and last year I did Disney princesses.
I think this year I might do cars, trucks, planes etc.