There are instructions -- brief ones, with a diagram -- for the Carrie Hall version of Chimney Swallows here:
http://fieldguidetoquilts.com/4Curve...diagrams2.html
You have to scroll way down to the bottom of the page to get to it.
When you use the site, go to the Quilters' Index, and if there's a link to a tutorial or to a diagram, there'll be a box around it. There'll also be a "Make It!" icon along with the block description.
Here's the link to the Chimney Swallows block. It's the last block on the page.
http://fieldguidetoquilts.com/4Curve...BlockInfo.html
You can look up blocks using the Google the Site page or look them up on the Thumbnail Index or Quilters' Index.