Sour cream is a great topping for the sake of satiety and mouth feel; my new favorite way to use it is on scrambled eggs, with a bit of salsa.
Note that not all sour creams are created equal: look for a brand with zero carbs and a simple ingredients list. This is my favorite, also because of its handy dispensing mechanism:
Ingredients: cultured cream. That's it!
I've benefited from the "low carbs two days a week" diet (and, of course, eating sensibly the other days), with some weight lost, and improvements in lab tests such as cholesterol and blood sugar (I'm a Type 2 diabetic). This blog details some of the things I enjoy on low carb and regular-carb days. I have no affiliation with, nor do I receive any compensation from, any companies and products featured here, they're just things I like and that work for me.
More on the Low Carb Two Days A Week Eating Plan here. The basics: 2 days a week (they don't have to be consecutive) strive to eat no more than 15 grams of carbs per meal, and have a snack with no more than 5 carbs. The other days enjoy carbs in moderation, and eat sensibly.