Materials needed:
~80-90g of sockyarn in two colors.
2,5mm dpns
two stitch markers
a scrap of yarn or a cabled needles to out some stitches away.

and some patience :)

Gauge: 30sts/10cm with 2,5 dpns stockinette in round

More tips and photos: in this blog post

NOTE: last page of the pdf contains only pictures and a link, please consider not printing it - forests will be grateful :)