Kynd uses openFrameworks to create pencil-like drawings of photographs:

Pencils has been the most primitive or the most basic drawing and writing tool since around the last century. It also was the one of the primary tools when I was in an art school and has been my best friend since then. Trying to simulate the tone of pencil sketches with programing codes, I reacknowledged that the beauty of of the tool lies in the delicate control of the blackness, strength and thickness of of lines, which I could hardly achieve in some of my attempts so far.

Post on his blog + more examples on his vimeo

See also Mycelium [Processing] – Fungal hyphae growth using images as food – by Ryan Alexander