What is your favorite "homemade" condiment? Any ingredient that you use that's homemade because either it's cheaper to make, or it just tastes better. This also applies for any "store" bought condiment that you kick up using your own personal touch ...
One of my favorite meatloaf glazes is a quick mix of tomato sauce and a few dashes of balsamic vinegar. Whisk it together and pour generously over the top of your favorite meatloaf recipe. It really kicks up your meatloaf.
I also never buy bread crumbs. I make my own.