You might Google for recipes that use cashew cream instead of regular cream. There's still fat, but it's a different type, and cashew cream is really, really delicious. Or maybe try something with roasted vegetables? There's not much that isn't better with roasted cherry tomatoes.

Also, this is a baked dish, not a traditional primavera, but it's got plenty of veg and is sort of creamy without being overly heavy. http://www.101cookbooks.com/archives/almost-cheeseless-pasta-casserole-recipe.html

could do a risotto? add asparagus, broadbeans and peas plus lots of parsley.

I make one with spinach and sun dried tomatoes and add some pesto into a cream sauce ... But I'd like a way to add veggies and cut down on fat, but keep the richness ....