While these blocks are relatively straightforward, especially the one on the right, it's the placing of the applique which is tricky. Since the blocks are so small, a fraction of an inch one way or the other makes a big difference.
Here are the 12 blocks I've done so far. Each one is such a challenge that I'm really enjoying them all. For someone with a short attention span, they're ideal, although I have to admit, my stitch-unpicker has had lots more use than usual!