Outside the sewing room, under the porch.
It crossed my mind that that might be mouse fur in the nest from one of Reginald's kills.
I am saving all my loose bits of thread for next spring. I'll distribute them at Imbolc, hoping that I will find bits of those colors in birds' nests.
In folk wisdom to save your loose bits of threads in a bottle is to create a charm of protection. Perhaps the charm will work on the birds instead.