Most days I will pack my own lunch as of late.
I usually make a pasta salad with raw peppers, red onion, pasta, and a tin of mackerel or tuna. Sometimes I add sweetcorn or something. I then drizzle it with a store-bought salad dressing in the morning (I make enough for two days the night before).
I am looking into making a cold asian noodle salad using my own dressing. I aim to make the pasta salad with my own dressings too but baby steps.
I also am experimenting with sandwiches, which I don't normally like that much, but I'm having a good go. I am fortunate in that I prefer brown bread. I sometimes shove some spinach (fresh) or cheese into a sandwich, but I think I will try adding things like hummus.
I avoid store bought sandwiches because they are really really bad... the ingredients list is longer than my arm full of preservatives. Plus they use low quality ingredients and charge a huge amount for 2 slices of bread with a bit of mush inside.
Making my own really helps me reach my target of 5 fruit and veg a day.