Most all whole grain and legume flours are a great and healthy substitute for white refined flour which offers densisty not nutrition. Making the switch is one of the best things one can do to improve and increase nutrition.
I am currently playing with the following subs:
Almond milk over dairy milk... Fat free plain yogurt for dips, spreads, cream/sauces, etc. ... and more legumes, potatoes, eggs and tofu as meat alternative protein sources.
Brandy, raw vegan pasta made with root vegetables, squash/zucchini is very easy to make. All you need is a spiral slicer or food peeler and peel into long noodles. Serve raw as is or lightly cook for a different texture. I say this because you mentioned carbs in pastas/etc... Carbs coming from whole grains are good and shouldn't be an issue. It's the carbs coming from alterned - refined sugars and refined grains that are problemetic. A potatoe substitute is cauliflower, especially the orange cheddar variety - delicious flavor. Ground nuts and seeds can be used in place of breading. Nutritional yeast for cheese flavors in place of cheese... this is used in vegan dishes a lot... liquid amino braggs in place of dressings, soy, etc. Another very important switch - table salt over to all natural sea salt...celery salt and all fresh herbs are great jazzer uppers. Making one's own soups and broths is also very healthy and handy.
Jeremiah 29:11 "For I know the plans I have for you,” declares the LORD, “plans to prosper you and not to harm you, plans to give you hope and a future."