I've been doing chia seeds, pecan pieces, dried coconut with almond milk. (I usually add a banana since I'm not trying to be strictly low-carb, but more paleo-ish. You could do berries instead.)
I like to do mushrooms and kale sauteed, then scramble eggs over them. (Fritta would be good too, just takes longer.)
Also, being gluten-free, I do a lot of baking with nut flours. You can make muffins from bananas and almond meal. Not super low carb with the bananas, but lower.
i'm not creative with food so this is a great question...but to TRY and answer yours, the first things that come to mind are omelettes, quesadillas (we use the low-carb flax seed kind), stir fry with meat and veggies (and tofu if you're into tofu), chowder
Breakfast: I do egg white omelets almost every morning for breakfast, so that's the first place my mind goes. But yogurt and cottage cheese make for good breakfasts also - and can be blended into smoothies for more options. And you can make pancakes with just banana and egg which is going to be lower carb than regular pancakes.
Dinner: We tend to do fairly low carb dinners only because I'm awful at making side dishes. So any "protein" - fish, chicken, steak, pork, etc. without carby sides. Fajitas are great, as long as you're not using tortillas - just grilled "meat" with onions and peppers, etc. Or on a salad. Or with a nice green veggie side. I love chili, and that can be fairly low carb - depending on whether or not you're putting beans in.
And one of my favorite tricks is to amp up the veggies in a dish, so you need less carbs anyway. So like @janniep said - a stirfry is great with lots of protein/veggies and you can add as much/little rice as you'd like to keep it lower in carbs. The same can be true of pasta. The more meat and veggies, the less noodles you need. (And a lot of people sub in spaghetti squash, or other squashes for pasta which are lower carb than noodles)
Re: low-carb breakfast & dinner ideas
Dinner: We tend to do fairly low carb dinners only because I'm awful at making side dishes. So any "protein" - fish, chicken, steak, pork, etc. without carby sides. Fajitas are great, as long as you're not using tortillas - just grilled "meat" with onions and peppers, etc. Or on a salad. Or with a nice green veggie side. I love chili, and that can be fairly low carb - depending on whether or not you're putting beans in.
And one of my favorite tricks is to amp up the veggies in a dish, so you need less carbs anyway. So like @janniep said - a stirfry is great with lots of protein/veggies and you can add as much/little rice as you'd like to keep it lower in carbs. The same can be true of pasta. The more meat and veggies, the less noodles you need. (And a lot of people sub in spaghetti squash, or other squashes for pasta which are lower carb than noodles)