Odd (but reasonable) things to add to mac&cheese
1. Tandoori Chicken
The first thing that came to mind. The tandoori spice would go so well with the rest of the mac and cheese.
And now my mouth is watering.
2. Raw tomatoes
Imho, mac and cheese can be too heavy. Adding raw tomatoes gives the dish a bit of crunch and some of the freshness it's lacking.
3. Chives & Thyme
To make the dish more multi-dimensional
4. Soy Sauce
This is kind of a cop-out for me, as I'd add soy sauce to just about anything. It provides such a nice salty flavor.
5. Fried Garlic
You might want to avoid others after eating this, but it would definitely be good