I-cord has dozens of uses.  Use it in your knitting as surface embellishment, as a tie, as edging - your imagination is the limit.  I-cord is simple to make - all you need is yarn and a pair of double-pointed needles.

Our Curiously Clever Clogs (felted, knitted slippers) uses I-cord as a sturdy edging.

How to Knit I-Cord (knit):

Step 1:  Cast on a few stitches.  I-Cord is usually made using 3 to 5 stitches.
Step 2:  Knit one row.
Step 3:  Do not turn the work.  Just slip your work to the other end of your double pointed needle.  Your working yarn will be at the "wrong" end of your work.
Step 4: Pull the working yarn tightly along the back of your work and knit the next row.
Step 5: Repeat steps 3 and 4 until you have I-cord of your desired length.