The pattern is super simple:
Worsted weight with size 7 needles
Knit in 2x2 rib for 30 rows
Knit garter stitch for 30 rows
Sew up the heel (garter stitch end). Gather the ribbed end for the toe, then sew the ribbing together until you reach the garter stitch.
On another note the website Treehugger has posted a couple good articles about knitting and why it's important. If you have a few spare minutes, they are great reads!