Onions, carrots, peppers, cucumber, tomatoes, green beans, broccoli, cauliflower, PSB, lettuce, sweet potoato, mangetout and baby corn (latter is a BIG treat!).
Freezer veg: peas, sweetcorn and green beans.
To a lesser extent (as in mainly DH and I like these): asparagus, courgette, parsnips, avocadoes, aubergine, spinach, butternut squash, mushrooms, radishes, chard.
Simple veg skewers are nice if you want to vary side dishes, also veg stir-fry. Roast veg is fab - summer (roast asparagus) or winter. DS2 and I fight over the roast carrots and sweet potato wedges!