We choose the pixels in part one to practice zooming into the photo to the point where we could select individual pixels. When zooming in on the photo we were able to select individual pixels to practice zooming in and out and to see the color of the individual pixel selected.
Step 12 made the image the selected width and size of our selected values that were entered in the control bar.
This image could be used for a photo of the apple itself or as a layer in another project in photo shop. You could use this apple as a logo or photo on your website.
Other ways you could generate imagery from scratch would be browse the internet for ideas and then use that as inspiration. From the inspiration you could think of an idea and transform the idea into imagery.