The project will automatically generate a noise image upon starting, to generate a new one, press space. The "time" variable represents how many seconds it took to generate the noise image. The "res" variable affects what pen size is used (as well as how many pixels to draw). This is locked at either 1 or 2 due to any higher resolutions being drawn with rounded edges. The "min brightness" and "max brightness" variables affect the brightness range it will allow for the generation. Go ahead and experiment with them, it can be quite interesting. You can end up getting some really weird effects if you have min brightness set to a higher number than max brightness, and I have no idea what it does in that scenario. If you want to save the image generated by this project, right-click (or tap with two fingers if you're using a Chromebook trackpad) and select "save image as..." Note that this will save the image at whatever resolution it is actively displayed on your screen, as opposed to saving at the 480x360p resolution of the stage. If you want that resolution, I'd recommend saving it while in fullscreen and then manually downscaling the image from there. Most image-viewing programs have editing tools that simple, you just might have to work a little to find them.
The code is 100% my own, and this was written completely in less than half an hour. I created this purely to see if I could.