I excavated a block of olive oil soap that I'd hoarded for wet felting, and experimented with making hats with a small flat, oval piece of packing foam and on some large beads in cling film (not good). The foam version worked pretty well, nursing the little flat egg-sized pockets into tiny hats using a reject wooden peg figure worked OK.
I'm going to needle felt the rest of the details on the robins (I might hold onto them with tweezers!) and embellish the little hats with felt holly leaves and seed bead berries.
Some of the snowmen and a bunch of other hand painted decorations are on their way to Emporium Gallery in Lichfield for their Christmas Exhibition of Festive Treasure; I'm really excited that the Little Brown Dog Workshop is going to be part of it!