I also scored at the second-hand store when I found someone's vintage fabric-covered box full of embroidery thread and darning yarn. I brought a few cards home to use to darn V.'s socks.
I like the economy and the ecology of sock-darning. I have more time now and it makes so much sense to repair a small hole rather than throw two socks away. My friend Corey says that brocanteurs were recycling before it became a trend.
My Mom used to have a flowered biscuit tin to hold all of her darning and embroidery thread and I remember her wearing a thimble... I love vintage sewing notions and think that I'll be looking out for more of these on future trips.
Do any of you darn? or sew? or knit?