One Marlene sock by itself looks a little lonely:
One Marlene sock with some feet is much better:
One sock is still on the needles, not pictured.
In an amazing turn of events, I found some Wooly Nylon thread on sale at the Joann Fabrics near my work (which, to be honest, is one of the worst Joann Fabrics in the world), in exactly the shade of blue-green I needed. So the heels and toes are reinforced with that.