|Double Irish Chain|
I didn't make this block because I don't think it's one to use in a sampler quilt. You can find a free pattern for 15" block at Quilter's Cache.
It's a very easy pattern to make. It's made from two alternating blocks. One block is a 25 patch block and the other a square with sashing and cornerstones for lack of a better description.
Here's an example of an antique Double Irish Chain quilt from Nancy Cabot's era-
And look at this really scrappy version-
There are several antique Irish Chain quilts to look at here at the Quilt Index.
Tomorrow-True Lover's Knot