Paul Ferragutit has created a DIY printing system that uses felt pens, blotting paper, and a time based algorithm to create an amazing "pixelated" aesthetic:
"According to the grey value of a pixel on an image, the felt pen remains in contact with the blotting paper for relative periods of time. Consequently the ink will bleed through the paper creating a variety of different sized stains, gradually building the image. It can take around 34 hours to print one colour image. The slow printing process and the imperfections we obtain every time is what makes every print unique."
Via TRIANGULATION BLOG