I think it's clear from this post that I wasn't really happy with the back of my mandala cushion. Something was off, but I couldn't put my finger on what. I took it to a craft group meeting and got the answer - the back needs to be blue to tone with the front of the cushion. Aha. Yes. So all I have to do is detach it from the front, unravel it, wind the cotton into skeins, dye them blue and then redo it. Simple. Simple but a trifle tedious, so I have left it until the deadline loomed.