Well, this is actually a question, but first is a demonstration of why you should replace the oil and the oil filter as per the toyota servicing schedule...unless you too want piston rings that are so full of carbon deposits that they are seized in allowing the engine to burn more oil than the Iraqi military fleeing the UN.
click for larger image
And now for the second image I have a question. Is the discolouration (it's slightly goldish looking) simply a result of the oil getting cooked by combustion gasses? Possibly the result of old oil and the fact that the car that this came from was burnt to the ground?