Another vote for the Taifun tofu - the olive one is AMAZING!
Avocado and tomato is always a winner for me, the fat keeps me satisfied. I like to mash the avocado with some lime, salt, pepper and a sprinkle of smoked paprika.
Tofu 'egg' mayo (obvs vegan mayo)
Any kind of bean or lentil pate - google to find ones yo like the look of. A white bean pate spread with caramelized fennel is a yum sandwich.
Make your own burritos or fajitas at home and bring those in for lunch. Loads of vegan/veggie mexican dish ideas on the internet.
Its an old fav but humus with griddled strips of roasted veg. Like a PP I like humus with grated carrot and falafal.
Slices of nut roast with cranberry
Baba ganoush slathered on with some baby gem lettuce for crunch - great in a flat bread type thing.
Roasted beetroot chuncks with mustard and parsley and a squeeze of lemon and a vegan yog drizzle in pita