Actually, I've thought of some more:
A couple courtesy of Katie I Can Cook - originally filo pastry but shop-bought puff pastry is cheaper
Courgette pie
Half pack pastry, rolled into large rectangle
1 large grated courgette
Tub of soft cheese
2 eggs
Couple of spring onions (or chives)
Salt and pepper
Whisk eggs and season. Mix in soft cheese, courgette and spring onions. Line small loaf tin with greaseproof paper (easier if you wet and scrunch it first) and put pastry in with the excess over the sides of the tin. Pour courgette mixture in. Fold excess pastry over the top to make a rough lid and cook for around 30 minutes until filling is set.
Ratatouille pasties
Onion, chopped
Pepper, chopped
Tin of tomatoes
and courgette, aubergine or similar that you like and is cheap
Oil
A little chopped basil
A little garlic
Half pack puff pastry
Grated cheese
A little milk
Fry garlic and onion for a couple of minutes. Add pepper and whatever other veg you're using, tinned tomatoes and basil. Simmer until thick. Roll out puff pastry and cut an even number of circles out with a scone cutter. Put a couple of spoonfuls of the mixture on a pastry circle, sprinkle some cheese on it and top with another pastry circle, seal join with milk and etc etc until pastry circles all used. 20 mins in oven and they're ready. Leftover ratatouille can be used as pasta sauce too.
Another - if you're ever in the supermarket and they have those chopped mixed veg packs going very cheap, they make decent veg crumbles. Just microwave veg for a few minutes, put in dish, pour over some veg stock and top with crumble (flour, butter, salt, pepper and walnuts if poss). Cook in oven for 25 minutes (there's a theme going on here) and it's done.
Leek and tomato crumble is nice too. Fry off half a pack of frozen leeks until soft (5 mins or so), add a pack of 6 largeish tomatoes, chopped up, and fry again for a couple of minutes. Add 300ml of veg stock, a tub of soft cheese and some dried or fresh thyme and mix. Pour into dish and top with same crumble as above but with mature grated cheese added too. And cook in the oven for - you guessed it - 25 mins.