Well my swapping friends, I think this must be the year of the Irish Chain block. Here is another variation from Lori Holt. The two different blocks make an interesting and eye appealing quilt that uses 2.5's. The alternating block of smaller squares are made from 1.5" squares with background borders. The video has lots of chatting about her method of keeping scraps and the second half of the video is how she keeps her quilt journal. You can easily take a peek at the blocks and skip the rest if you so desire.
Checkerboard Chain
https://www.youtube.com/watch?v=OdCvNn2qXmY