So basically you can link broken images in a signature that will point to a thread and every time your signature is viewed (even from other threads) it will boost it up a view or however many images they linked in the signature.
I found a way to link multiple in one signature and make the browser load them all and not assume they're all the same asset, all you have do is add ?a=1 and increment it on each one.
If you want to see it in action you can go here and find "Visual Studio" at the bottom of the page and inspect my signature, it should load this four times.
Web Debugger Captures:
This is Fiddler 4 with Google Chrome done by me.
This is FireFox's thanks to @Z61