The block (the white X with 4 color sides) is a Chimneys and Cornerstones block. The sashing (the wide piece between the X blocks) uses 9-patches for cornerstones. Here's a Quilter's Cache's directions for Chimneys and Cornerstones:
http://www.quilterscache.com/C/Chimn...onesBlock.html
Scratch that - just realized the center block is a different size on the chimneys and cornerstones block.