Warning: Do not run random javascript stuff you find on the internet unless you know what it's doing.
This little app does not save any data; it's completely local. I don't know how to do server side programming.
Your image will automatically be converted to 32x32 pixels.
This string is an array of arrays which holds the hex (color) value of each pixel.
Navigate to the avatar drawer on Two Cans and open the dev console (on chrome, press f12).
Go to the sources tab. Locate drawing_editor.js in the sidebar.
Replace this value:
With your string:
Make sure there's a semicolon at the end of the line, then CTRL-S to save the .js.
Draw a random dot with the pencil. It won't actually draw, just update the canvas to the image you loaded.