My Mille Colori Scarf!  I love how it turned out!  I used 2 balls, Crochet CO 24, Box Stitch... 
sigh... my first totally selfish knitting.  Now, if only we'll get a little cold weather.

Box Stitch:
 Cast on multiple of 4.
Rows 1 & 2:  K2, P2
Rows 3 & 4: P2, K2
Repeat.
It looks like this when finished.

Crochet Cast On is so wonderful!  It looks identical to a regular Bind Off.
