Alton Brown has a recipe called Scrap Iron Chef's Bacon.
He made a cold smoker out of three book lockers/gym lockers, flexible tubing used for venting a dryer, a fan from an old computer connected to a battery, some alumimun foil, a cast iron skillet and some wood chips for smoke. He used a Polder digital thermometer to make sure the temperature was monitored. He advised not let the temp in the smoking chamber rise above 80 degrees. He is the MacGyver of food.
If you've never watched an Alton Brown episode of Good Eats, check it out some time on Food Network.