well for veggies (like your salad) there is fiber in lettuce i bllieve.. You subtract the grams of fiber from the carbs.. so say your lettuce had 6 carbs and fiber was 3 grams then you only count 3 carbs because of the 3 grams of fiber..
eggs, have like .5carbs per large egg.
cheese, well the kind I eat, has 1 carb per serving (it all veries though, and there is some zero carb out there)
nuts are higher in carbs.. not sure how much offhand.
meats.. (MOST) have NO carbs in them.. or for some deli meats 1 carb per serving (it can be more depending on the meat)