That's impossible to do, since on everything there's a copyright. Simply open any jpeg in Paint and scale it bigger under "View". As big as single pixels begin to be clearly visible. Draw a color with the eyedropper and paste the color on that very same pixel (or the one next to it). Sometimes you will notice a more or less drastic change of the pixel's color.
But I did further experiments: It's even more strange. If you scale to somewehre between original and maximum possible scaling it takes wrong colors. On maximum possible scaling however the problem strangely disappears and you cannot reproduce it anymore.
However: You can still paste a false pixel color into maximum scaling that was taken while you did scale to a size between original and maximum!
If you don't believe me that I saw this with my own eyes it's no problem. I just wanted to share what I saw. Maybe you or other members can find the time to test it. I know that you didn't say that I made it up, but only that the description is not enough. But it's really not that hard to test it with following my description. It's an uncomplicated test to do.