Salad Vegetables:

lettuce
spinach
shredded or diced carrots
chopped celery
diced bell peppers
shredded purple cabbage
diced cucumbers
sliced radishes
sliced olives
diced tomatoes
fresh sprouts
diced avocados
green peas, lightly cooked and cooled

Protein Additions:

thinly sliced steak
sliced grilled chicken
bite-sized breaded chicken
diced hard-boiled eggs
chopped pastrami or turkey ham
sliced turkey breast
taco-seasoned ground beef
shredded cheddar cheese
garbanzo beans (chick peas)
kidney or black beans

Toppings:

grated Parmesan cheese
bacon bits
sunflower seeds
sliced almonds
croutons

Dressings:

Olive Garden dressing recipe 
French dressing recipe 
Vinegar and Oil dressing recipe 
Honey Mustard dressing recipe