A question people often ask is what to eat for breakfast when you're following the paleo diet. People have said it before, but i'll just repeat; breakfast is like any other meal of the day. Just make sure there are vegetables and there's protein. As long as you're not having only fruit and nuts for breakfast*, you're on the right track!
This is one of the meals I make quite often, for breakfast, dinner or lunch. Mostly when I forget/neglect to make lunch the night before and I'm rushed in the morning, I'll just grab a bag of salad- toss in some olives+oil and close it tightly. Then throw that in my bag with a can 'o tuna. All 3 ingredients are staples in my kitchen.
I'm a bit planning-challenged, but I've managed to work around that by having certain items always around. A lot of my meals are based around bags of salad. They are pure win.
*This was one of my beginner mistakes, and just goes to show that you need to understand some of the theory behind the paleo or other healthy diets. It's not just a list of food you can and can't eat.