I've been experimenting with small magnetic white boards suitable for tabletop . They are available at Walmart for $5 - $15 in sizes from 8x11 to 17x22. Larger boards get more expensive quickly. These will fit well with my 1.5-inch demonstration stones.
These board pictures are a comparison against a slotted board that tends towards beige/brown and a Tibetan Spruce "Shin-Kaya" board from YMImports that tends toward a golden color. I really like the Shin-Kaya board and was trying to get similar to that.
The first picture is the strawflower, the second is the Hubbell House Golden Maize, and the third is the Hubbell House Golden Maize and the summer squash. Again, the Shin-Kaya board is the same board in each picture.
Pictures are not good for getting colors correct because of the changing light and exposure, so I use the same reference Shin-Kaya board for each picture. To my eye, the strawflower is too biege, and the summer squash is too yellow.
The overall winner? valspar brand Hubbell House Golden Maize.