I just watched the tutorial from MSQC and her "second set of arms" was hilarious! Some times I wish I had them too.

I personally would do this jelly roll by cutting white, or whatever solid color, into quarter triangles......cut square whatever to get 4 - 2 1/2" QST triangles, I think 4", but have to check formula... then double diagonal, getting 4 out of square. Then sew one to one end of each strip, then sew strips together....hmmm, I have an odd jr, may try my own idea........