Don't do white elephant. It's mean. No one goes home feeling good about getting some old ugly candle that has seen a better day or is so ugly that it's going in the trash can as soon as no one is looking. I hate white elephant games and refuse to participate. And even if there is a dollar limit to the gifts to let people know they are supposed to buy a gift to bring there is always a few that know white elephant means used gifts no one wants.
Dirty Santa is much nicer. Those gifts are new items that are desirable. The dirty part is the taking the cool gift away.
Dominoes
Couple of card games in the same gift bag
Bottle of bath salts and a loofa
Foot massage oil and nail polish and those things that go between the toes
Christmas music that's really new, new album of some popular star
Hand knitted or crocheted scarf with mitten or hat set
Hand made crafts that no one else will have
One year my father in law got a picture drawn by one of his students that was deaf. He still has it hanging in a prominent place. Just drawn by hand but impressive.
Here are some links for ideas
http://www.pinterest.com/rainiepiccione/dirty-santa-gifts/
http://tutta.hubpages.com/hub/best-dirty-santa-gift-ideas
http://knue.com/best-dirty-santa-gifts/
http://uniquegiftideasblog.com/dirty-santa-gift-exchange-...
Love the 6 pack in this one, cool!
http://www.prairiehive.com/2012/12/dirty-santa/