You can't make the pixel size any larger ("pixels is pixels"), so instead, what you'll want to do is write a function that will color the pixel of choice and the pixels around it (to make, say, a 3x3 pixel "block"). Think of the square as a grid of pixels, and it's easy to figure out the coordinates of the surrounding pixels.
Warning: Your function will need to deal with boundary conditions (e.g., what happens when you try to color all of the pixels that surround the pixel at 0,0?).
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