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##Java

Variations of a color picker in 512x512. Elegant code it is not, but I do like the pretty pictures:

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;

public class EighteenBitColors {

    static boolean shuffle_block = false;
    static int shuffle_radius = 0;
    
    public static void main(String[] args) {
        BufferedImage img = new BufferedImage(512, 512, BufferedImage.TYPE_INT_RGB);
        for(int r=0;r<64;r++)
            for(int g=0;g<64;g++)
                for(int b=0;b<64;b++)
                    img.setRGB((r * 8) + (b / 8), (g * 8) + (b % 8), ((r * 4) << 8 | (g * 4)) << 8 | (b * 4));
        
        if(shuffle_block)
            blockShuffle(img);
        else
            shuffle(img, shuffle_radius);
        
        try {           
            ImageIO.write(img, "png", new File(getFileName()));
        } catch(IOException e){
            System.out.println("suck it");
        }
    }
    
    public static void shuffle(BufferedImage img, int radius){
        if(radius < 1)
            return;
        int width = img.getWidth();
        int height = img.getHeight();
        Random rand = new Random();
        for(int x=0;x<512;x++){
            for(int y=0;y<512;y++){
                int xx = -1;
                int yy = -1;
                while(xx < 0 || xx >= width){
                    xx = x + rand.nextInt(radius*2+1) - radius;
                }
                while(yy < 0 || yy >= height){
                    yy = y + rand.nextInt(radius*2+1) - radius;
                }
                int tmp = img.getRGB(xx, yy);
                img.setRGB(xx, yy, img.getRGB(x, y));
                img.setRGB(x,y,tmp);
            }
        }
    }
    
    public static void blockShuffle(BufferedImage img){
        int tmp;
        Random rand = new Random();
        for(int bx=0;bx<8;bx++){
            for(int by=0;by<8;by++){
                for(int x=0;x<64;x++){
                    for(int y=0;y<64;y++){
                        int xx = bx*64+x;
                        int yy = by*64+y;
                        int xxx = bx*64+rand.nextInt(64);
                        int yyy = by*64+rand.nextInt(64);
                        tmp = img.getRGB(xxx, yyy);
                        img.setRGB(xxx, yyy, img.getRGB(xx, yy));
                        img.setRGB(xx,yy,tmp);
                    }
                }
            }
        }
    }
    
    public static String getFileName(){
        String fileName = "allrgb_";
        if(shuffle_block){
            fileName += "block";
        } else if(shuffle_radius > 0){
            fileName += "radius_" + shuffle_radius;
        } else {
            fileName += "no_shuffle";
        }
        return fileName + ".png";
    }
}

As written, it outputs:

If you run it with shuffle_block = true, it shuffles the colors in each 64x64 block:

Else, if you run it with shuffle_radius > 0, it shuffles each pixel with a random pixel within shuffle_radius in x/y. After playing with various sizes, I like a 32 pixel radius, as it blurs the lines without moving stuff around too much: