I have the socks for the yarn pooling challenge on my needles. And there is definitely pooling happening. When I was doing the ribbing at the top of the socks, the colours were almost totally stacked on top of each other. I didn't do anything special to get them to do this, either. I cast on 60 stitches on 2.75 mm needles and did k2p2 ribbing. I'm at the point of starting the decreases for the toes. What will be really interesting will be to see if the second sock does the same thing.
We have been having internet connection problems, so I'm going to make this quick, while the connection lasts. I'm linking up to Judy's On the Needles.