We do a recipe using tagliatelle, lemon zest and juice and grated parmesan all mixed together with some black pepper for seasoning and often serve it with chicken or fish.
The proper receipe was taken from a Delicious or Sainsbury's magazine a few months ago so can't post it unfortunately but the ingredients are basic and we generally just do it to taste rather than follow the recipe religiously.
An easy carbonara sauce (not sure if it's how you do it 'properly' but it's what my mum always used to make!) - fry some chopped bacon (can also include chopped onion and sliced mushrooms if you like), beat a couple of eggs with some cream, cooked the pasta and drain then return to the pan with the bacon and egg mixture, add in some grated parmesan and seasoning and mix together. The egg should cook slightly with the heat from the pasta (but not so that it is like scrambled eggs!) but if it doesn't cook to your liking you can always put a low heat back on.
I have also seen recipes using 'spring' vegetables and cream, such as peas, broad beans, asparagus.
You could do a roasted vegetable lasagne and leave out the toms. Roast aubergine, courgette, mushrooms, onion, etc and layer with cooked dried lasagne sheets (as there is not enough sauce it won't cooked as well if used uncooked), or fresh lasagne, with a white bechamel sauce. Finish the top wth bechamel sauce, grated parmesan and breadcrumbs. This way of doing lasagne is also quicker because you only really need to brown the top and make sure it is heated through as everything is already pre-cooked.
Helen