Below is some illustrations:

Angel, source (click to enlarge)

Fade, source, (click to enlarge)
This method looks quite interesting and strange. In theory, pictures are made of thousands of pixels, now they are made of words, instead.
Moreover, the text that contains characters to make whole image can be customized by yourself.
To make a picture by this way, carefulness in color words are significant. If thay are done by hand, it's possible but will take a long time. In fact, they have a software to make those...