4 cheese sauce:

Take some gorgonzola, taleggio, parmeasan, and emmenthal (or similar cheeses) more or less in similar quantities (80-100 g each) grate the hard cheese, put all the cheese and some milk or milk cream in a pan, put it on the fire and mix with a wooden spoon or similar until you have a white homogenous cream. Then just pour it on you pasta and bon apetit, literally takes 5-10 minutes total.
Mushrooms sauce:

Get 400g of mushrooms, some olive oil, abit of butter, a few fresh tomatoes (NO SAUCE), some parsley and a small bit of garlic. Put the oil and butter (about 30g of it) in a pan and let if cook for abit. Add the garlic and let if fry/toast abit. Add the mushrooms (after having cleaned them up in water) and let things cook for 10 minutes. Add the tomatoes, after peeling them off and cutting them into small cubes (make sure you take out the seeds as well) then add them in the pan, with one or two spoons of waters to make sure the sauce doesn't dry out too much. Let it cook for a few more minutes, add the parsley (super-finely chopped) and salt and pepper as you see fit.
Pesto:

For this one you need basil, olive oil, parmeasan, pine nuts, garlic and salt. For this recipe you're gonna need a mortar and pestle, or a pan and a blunt object to serve the same function. Take the garlic and a few grains of salt and mach them almost 'till you have abit of a cream (don't exaggerate with the garlic, a couple pieces should be enough) then add the pine nuts, about two-three spoons or a big handful and keep mashing. After awhile add about 40-50g of basil leaves (which you need to wash in water and let them dry abit previously) and mash some more, doing circular movements to squeeze the leaves rather than chopping them. Then add the parmeasan and... guess what... keep mashing, and at last abit of olive oil and keep mashing some more. This sauce is the most dense out of the three, so don't be upest if it isn't super-creamy because it's not supposed to be.
I guess you will have to go shop for any of these, but these are all generally good alternatives for not-spicy and not heavy in moeat and tomato sauces. So maybe not for this specific occasion, but in general if you want to try something different, here we go.

