Photographing Yarn

Lately I have been a little frustrated trying to get accurate pictures showing the true colors in my yarn. On days when it is cloudy or I can't take pictures till after dark the results are especially horrible. I think I've solved that problem.

The pictures above were all taken with the same point and shoot camera and the same lighting with different backgrounds in my new Light Box.
The one I got is similar to this one, but I got it on sale for $35. (You can also build your own by making a pvc pipe frame, draping a sheet over it, and aiming two halogen desk lamps at it with color neutral bulbs.)
I think the blue is best for the yarn and the gray is best for the hat. I'm going to have fun playing with this thing.