I keep most of the feet for my Bernina 240 in a plastic case with dividers (just like this one) stowed away in a drawer. I don't use the plastic accessory box that came with it. But there are several feet that I use a lot; those feet were taking up space in the area next to my machine (and I kept knocking them off).
My solution was to remove the foot "shelf" from the accessory box and stick it to the underside of my Horn Cabinet. I used the 3M Picture Hanging Strips (like velcro). BTW, I think that there are coupons on their website!
Now I have easy-access to my feet!