Rag rug. Super easy and fast to make. Not crochet, but has the same effect. My rag rug lasted over 10 years!
Nalbinding : basic instructions
NALBINDING SOCKS: METHODS OF CONSTRUCTION, tutorial including starting tips, and 5 different approaches to making socks with heels, eg Heel Type A to E, by Shelagh Lewins. Please see link for more info and illustrations!
naalbinding - Figure 5: casting on in Oslo stitch and methods for sock construction
Basic Nålbinding part 1: Oslo Stitch Tutorial and link to Part 2 on Dilettante at http://www.dilettante.info/nalbindingpages/osloprimer/osloprimer1.htm