Yarn bombing is one thing (still love it), but check out Jo Hamilton, who creates these labor intensive crochets portraits from photographs by hand- no computer imaging, no sketches, or graphs. She just uses yarn and traditional crochet techniques working them from the inside out. Go see the rest of her work here.
New York-based Artist, Michael Mapes takes portraits, dissects them and then places them into specimen boxes, creating this curiously scientific approach to beauty & preservation. You can see this one and others like it at his virtual lab at room62.com.