I feed a blend of vegetables/fruits as well. While they might not "need" them, I do feel they benefit from the nutrients. Also, animal nutritionists such as Dr. Karen Becker and Monica Segel advise to include them. Somethings I do fresh/frozen and sometimes I add in powder from various manufacturers.
I do not add in rice or potatoes. I want the high value vegetables like bell peppers, spinach, broccoli, squashes, pumpkins. And high value fruit like raspberries and blueberries. Look up "super food" and go off that list for vegetables native to your area.
As far as meats, I feed a lot of venison. Dogs get their energy from fats (look up Husky studies on nutrition), so you don't want very lean. I try to keep an 80/20 or 75/25 ratio. If you have rib meat from the game animals, there is typically a lot of fat in there that you can mix in and that meat should be high in Omega 3 because the animals are eating grasses instead of corn/wheats.