I'll mix just about anything into quinoa!
Depending on what you want to serve it as a side with, try: sauteed spinach and chopped artichoke hearts; onion, pepper, and lemon juice; pine nuts and golden raisins or currants; pine nuts and feta cheese; oregano, basil, and parmesan.... etc!
Also, you can save leftover quinoa for breakfast-- treat it as you would oatmeal. Add a little milk and reheat, then top with cinnamon, fruit (blackberries, bananas, etc), and a little sweetener (agave, honey, or pure maple syrup). Yum!