!(???) && Profit!!!

bookmark.js

/*
 * 1. Find a picture, open it, and disable your popup blocker
 * 2. Enter the following into your address bar
 * 3. ???
 * 4. Profit
 */

javascript:function dr(e){h=e.height;w=e.width;var d=document.createElement("canvas");d.width=w;d.height=h;ct=d.getContext("2d");ct.drawImage(e,0,0);im=ct.getImageData(0,0,w,h);dt=im.data;a=(c=Math.ceil)(w/(z=30));a=2;b=[];str='<p style = "line-height:6px;font-size:6px;padding:0;">';for(j=0;j<c(h/a);j++){for(i=0;i<c(w/a);i++){t=[[],[],[],[]];for(y=j*a;y<(j+1)*a;y++){for(x=i*a;x<(i+1)*a;x++){t[0].push(dt[(pt=y*w*4+x*4)]);t[1].push(dt[pt+1]);t[2].push(dt[pt+2]);t[3].push(dt[pt+3])}}b.push(ls=[(sm=function(f){sg=0;for(id=0;id<f.length;id++){sg+=f[id]==undefined?0:f[id]}sg=c(sg/f.length);return sg>255?255:sg})(t[0]),sm(t[1]),sm(t[2]),sm(t[3])/256]);str+="<span style='background-color:rgba("+ls[0]+","+ls[1]+","+ls[2]+","+ls[3]+")'>&nbsp;&nbsp;&nbsp;</span>"}str+="<br>"}str+="</p>";return str}function dp(f){try{nw=window.open();nw.document.writeln(f)}catch(d){alert(d)}}images=document.images;s="";for(var abc=0;abc<images.length;abc++){if((w=(image=images[abc]).width)>=30&&(h=image.height)>=30){try{s+=dr(image)}catch(err){}}}dp(s);

Full.js

// Compress and add javascript: prefix, then save as a bookmarklet

function process(image){
	h = image.height; w = image.width;
	var buffer = document.createElement("canvas"); // Anonymous canvas
	buffer.width = w;buffer.height=h;
	var ct = buffer.getContext('2d');
	ct.drawImage(image,0,0);
	var data = ct.getImageData(0,0,w,h).data; // This may raise an exception for external images.
	var pxs=2; // Height-Width of the pixel block
	var str='<p style = "line-height:6px;font-size:6px;padding:0;">';
	for (j=0;j<(c=Math.ceil)(h/pxs);j++){
		for (i = 0; i < c(w/pxs); i++){
			t = [[],[],[],[]];
			// Processes a 4x4 px block and averages the color+alpha
			for (y=j*pxs;y<(j+1)*pxs;y++){
				for (x=i*pxs;x<(i+1)*pxs;x++){
					t[0].push(data[(ptr=y*w*4+x*4)]);
					t[1].push(data[ptr+1]);
					t[2].push(data[ptr+2]);
					t[3].push(data[ptr+3]);
				}
			}
			var color=[(sm = function(l){sg=0;for(id=0;id<l.length;id++)sg+=l[id]==undefined?0:l[id];sg=c(sg/l.length);return sg>255?255:sg;})(t[0]),sm(t[1]),sm(t[2]),sm(t[3])/256];
			str += "<span style='background-color:rgba("+color[0]+','+color[1]+','+color[2]+','+color[3]+")'>&nbsp;&nbsp;&nbsp;</span>";
		}
		str += "<br>";
	}
	str += "</p>";

	return str
}

function out(dt){
	try{
		nw = window.open()
		nw.document.writeln(dt);
	}catch(err){
		alert(err);
	}
}

images = document.images;s="";
for(var abc = 0; abc < images.length; abc++){
	if ((w=(image = images[abc]).width) >= 30 && (h=image.height) >= 30){
		try{
			s += dr(image);
		}catch(err){
			// Image is on a different subdomain
			// For now, do not do anything.
		}
	}
}
out(s);

Sorry about my ignorance, but, which one is the url that I have to type?
thanks

@tkalve: haha, it's just something that I thought would be cool to do. Most of the things that I write will never be useful :P

@cheluis: Sorry about the confusion, enter the entirety of line 8 on bookmark.js in your address bar. If no images show up, then go to the address of one of the images and try again. (the HTML5 specification disallows getImageData on remote images :/)

Oh this is pretty cool. Thanks!