This time of year there isn't an abundance of dyestuffs to be found, but in the semi-thaw we had last week my kids gathered up a bunch of soggy acorn caps from under one of the oaks.
I wasn't sure how much tannin they would still hold after a winter of heavy snow but I stuck them in a quart jar with water anyway and let them sit for a few days.
They made a good dark "tea", telling me there was hope, so I put them in the dye pot and let them simmer with a little more water for about an hour. After straining them out, I added a white cotton t-shirt, a small amount of unmordanted wool, and some white and previously-dyed (with red cabbage) cotton floss.
Each picked up the nice golden tan from the acorn caps, and once dipped in an iron solution (let a steel wool pad sit in a cup or two of vinegar overnight and you have an iron solution) the golden tan deepened and turned towards grey.
The results are nice, with a look like driftwood or my old weathered table. (my photos are not capturing the depth of color, sadly) For those of you that would like to try natural dyeing, this one's an easy one to start with.