Sandwiches, beans/cheese/egg on toast, soup, wraps - standard stuff like that.
DS also really like tortilla but it takes a while to make. He's also a fan of cous cous salad - cous cous with anything in the fridge chucked in, peppers, tomatoes, cucumber, bits of cheese, chickpeas, etc
At the weekend, I quite often do an "odds and sods" lunch where I just chuck a load of bread, cheese, salady bits on the table and let people eat what they want. It's good for using up leftovers and getting DS to try new things. He likes "bits and bobs" for a snack too, a sectionned plate with bits of chopped up veg, fruit, raisins, rice cakes etc.
Snacks are usually fruit, cheese and crackers or cake.