The tricky part was that I had very specific dimensions I wanted the finished runners to be, and none of the quilt block dimensions quite fit. So I got out my handy-dandy graph paper and sketched out 2 arrangements just the size I needed. To simplify things a bit, I made all the background strips between the blues and lighter grays to be 1 1/2" unfinished, and then basically did all the math one block at a time.
Just for the record, the square piece measures 24", and the oblong is 16"x53".
This project was on my Q3 Finish-A-Long list. Linking up with Finish It Up Friday and Fabric Tuesday.