Well, plan B didn't work either - the blocks still didn't look like the makings of a quilt. So I made 12 more blocks, with a wild mixture of colours - the only "rule" was that there had to be either 3 warm colours and 4 cool colours in each block, or vice versa.
Here they are, laid out on the lounge room floor. And yes, it's a terrible photo, the light wasn't good.
Then I spent an afternoon shuffling them around until I was satisfied with the layout.
This is probably how it's going to be. Now I'll begin embroidering and embellishing them. I have no idea if this is going to work.