Yay, another meta... but this time I'm allowed to forget about it.
You can take the image before you and change any SINGLE puce (#CC8899) pixel, or any FOUR puce pixels ARRANGED IN A SQUARE. To be fair, you must then wait for four more pixels to be added before you can change another. When the majority of contributors agree that the image is finished, I will convert all puce to transparent and begin a new template.
Have fun with that.
Also, remember to save as PNG.