I have salad for lunch most work days. It's usually a hit and miss mix of whatever I have in the fridge! I use up lots of leftovers in my salads e.g. potatoes, tofu, rice. When my salad box in fridge looks empty I have a look online to see what is on offer at Morrisons/Aldi/Lidl/Tesco etc and buy the best value things from the shop
I live on my own and I never can be bothered to make a salad every night so I tend to make a big one on a Sunday which lasts 3 days and then re-make on Weds night for next 2 days. This is just the salady bits and then I add extra to it as the week goes on.
This week I have cooked a big pan of pasta so will have pasta salad with mixed leaves, tomatoes, cucumber, carrot, sweetcorn, canellini beans and hard boiled egg. Topped with Hellmans fat free vinegarette. Sometimes I pack the egg separate so I can had it as a snack whenever rather than with lunch.
Sometimes I do rice or couscous instead of the pasta. I find tins of various beans make great additions to a salad.
A good tip is to have lots of tupperware to store the leftovers in and then add to the salady mix whatever takes your fancy.
When I'm feeling very lazy I just chop celery, carrots, cucumber and peppers into crudites, store in water overnight, and then drain and take in the next day for work.
HTH
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