Lots of vegetarian salads keep in the fridge for a few days.
A quick one is:
Mediterranean Potato Salad
chopped boiled potatoes, red ones are good (a small bag)
spring onion (2 - 4 bunches, based on preference)
dry sundried tomatoes plumped in boiling water, drained and chopped
cumin, pepper, salt and olive oil to taste
serve hot or cold
Or March Hare Salad
3 cups cottage cheese
2 T fresh lemon juice
Salt and pepper to taste
With (based on your preference):
Diced or grated fresh vegetables, such as:
A carrot
A large tomato, or a handful of cherry tomatoes
A cucumber, peeled and seeded and chopped
Any color of bell pepper
A seeded, chopped jalapeno pepper
A scallion or a couple tablespoons of diced sweet onion
Fresh garlic (1/2 clove is plenty)
Choose some nuts from this category:
The best are a couple of tablespoons of sesame seeds and 1/4 C toasted sunflower seeds
Or use 1/4 C chopped roasted peanuts, walnuts, or pine nuts
Could also add:
1/2 C of minced parsley
A handful of cilantro leaves
A small can of sliced black olives
Sliced green olives
Water chestnuts
Sun-dried tomatoes
A dash of Tabasco
Both are from Moosewood cookbooks.