I don't have the circle attachment, but yes the ruffle foot and the walking foot which were difficult to store in the same box as the regular feet.
I decided on divided parts boxes from Home Depot much like the tackle boxes for fishing. My drawers in the Horn sewing center are shallow so whatever I used needed to be under 2" in height. Now I'm organized and I'm not worrying about a foot getting lost or dropped into the waste basket by mistake when digging for a foot. It's amazing to me how expensive some of these feet are but considering the science in making precise equipment for individual machines is what makes them so expensive.
Thanks one and all for your tips!