If the waffles you made are Belgian waffles, break the waffle apart into 1/4 pieces so they will fit your toaster. Toast until fully warmed through. If you have a toaster oven simply place the whole -- or 1/2 waffle depending on the size -- in the oven and toast until fully warmed through.
How about banana waffles? Chop up some dried bananas and stir banana bits into the batter before pouring it into the waffle iron.