I also mix the way seams are pressed on the same block. If you know your blocks are going to have intersecting seams with the next block you can press to alternating sides and Nest your seams together for less bulk. The spinning of your intersections look neat...but I have not yet been able to do it myself....aaarggghh!! I have been taught also to always press my backing seams open with a 1/2 inch seam for durability. Another subject open for debate!!