I looked at the tutorial you offered. Please note that it says to cut those squares at 9 1/2", not 9". Are you wanting all of your blocks to have the patterned fabric in the center? Apparently this will make one top with the pattern and one with the solid as the whirlwind. While the tutorial didn't show it finished, I'm assuming the two can be sewn together to create another design rather than sashing each block. (Hoping the seam doesn't misplace the connection of the two.) This would make an interesting play with your eyes! Thanks for sharing! I'm currently enjoying Eleanor Burns' Kaleidoscope/Donna Jordan's Summer Breeze patterns that create play on the eyes, too. Trying this one may be my next endeavor. It's fun to see how the same block makes different designs.

Oops! Just looked at that pattern again and at the beginning it mentions that these may not nest together well. But I might try that just to see how it goes.