What I do is fetch the image from an url like imgur
Save it in the Osbot/data folder and load it in next time, if it's not there download it again.
public static BufferedImage getImage(Script script, String url) {
try {
return ImageIO.read(new URL(url));
} catch (IOException e) {
script.log("Failed to load image with url: " + url);
}
return null;
}