The other day, when we had frost on the ground, I saw this and thought at first that it was a frozen pine-cone:
Of course closer inspection revealed that it was not. It was a flower-bud cluster. Here is one in non-frosty conditions. The furry spines make it look as if it has a coating of ice crystals:
The Pulmonaria evidently self-seeds pretty readily, and pops up in all sorts of unexpected places, but that suits me fine because it is helping me to give my garden a more natural look.