Soy Sauce Marinade. Fill a bowl with some splashes of soy sauce, and throw in some cubes of tofu. Mix the cubes around to get sauce on all sides. So good, you could cook with it or even eat it as a snack.
Teriyaki Marinade. Use teriyaki sauce instead of soy sauce.
Sriracha Marinade. Squirt the hot stuff on tofu.
Olive Oil Marinade. More mild in taste, drizzle olive oil on tofu cubes and sprinkle on some sea salt.