I love wholemeal pasta and I think it does fill you up. WM rice is not as nice but I've seen people mention using half white and half wm to make it nicer.
I love the tiny wm pasta at ASDA. It's made for children but that doesn't stop me!!!
I do green days all the time - veggie - and i usually have white pasta, but decided to change to wholewheat. I had spaghetti and home made tomato sauce wioth quorn meatballs yesterday and can confirm that the wholewheat pasta fills you up all night!