Here is a quick tutorial on how I am going about my Log Cabin squares, it is just a variation of a typical granny square (please let me know if you see any mistakes in the directions)…
Update (and update corrected): post with pics of the finished Gray Area Log Cabin Blanket which shows what I did with the border, for an estimate of the yarn used, go to the Log Cabin Blanket post.
Start with a sliding ring, and make a 1 round granny square. To do that, in the sliding ring you ch3 (counts as 1st dc) 2dc in the ring, [ch3, 3dc in the ring]3 times.
End with a ch3, tighten the loop, slpst into the top of the first ch3. End off.