We aren't veggie but have one veggie week in four ( plus three veg days a week) to reduce our meat consumption ( and up the veg)
A typical veggie week for us would be
Monday- chickpea and butternut squash tagine with flatbreads ( tagine can and should be done in advance- it's better the day after)
Tuesday- cherry tomato, goats cheese, spinach and basil on puff pastry sheet and baked. Not gourmet but delicious.
Wednesday- minestrone
Thursday - noodle and veg stir fry
Friday- egg, chips and peas
Saturday-spinach and red lentil dhal and rice/ flatbreads
Sunday - Sunday roast - I do a chickpea loaf ( usually with some of yesterday's dhal mixed in- you can slice and freeze too - it's nicer in fact to slice and freeze as when you fry the slices up they get a crispy coating and a little black around the edges) and roast lots of veg - carrots, potatoes, parsnips, with buttery swede mash, and some steamed and peppered green beans, topped with vegetarian gravy ( from a packet I'm afraid to say)
Lots of other favourite veg options-
Soups- leek and potato, broccoli and Stilton, tomato, carrot and coriander, winter veg, Thai squash soup, asparagus, courgette, lentil, mushroom, - leading into more stew based soups- barley and winter veg, laksa, ribollata, ramen, Mexican bean, ottolenghi chickpea tomato and bread soup- there's just loads of options.
Speaking if ottolenghi- his medjera is beautiful cheap veggie cuisine, as are many of his recipes.
Vegetarian lasagnes are quite varied too- squash and roasted red pepper , kale and mushroom, quorn, roasted veg, aubergines lasagna( Jamie Oliver does a nice aubergine lasagna)