Blind drawings can be really interesting, especially if you're drawing detailed subject matter such as faces. It gives an effortless abstract result.
Continuos Line Blind Drawings
February James - Blind Contour Line Drawing
an idea for blind contour line drawing
beautiful fine line pen drawings of shells by my friend @Alice Du Port
Assignment #7 Blind Contour Drawing of Portrait - Mrs. Zotos Art 1
50 Layered Blind Contour Drawings by Tribastone, via Flickr
Self portrait blind contour drawings in black ink, accented with highlighter.