I use a two-sided fishing tackle box. Using a labeler, I made numbers for the cubbies. After I placed a foot in a hole, I made a corresponding a number/label with the name of the foot that I put on the lid. Sometimes I buy a foot for a specific project and umpteen projects later can't remember what the darn foot was called.
I decided the explanation was harder to understand than a visual. I hope this helps. The tackle box I just bought for my daughter's sewing feet has colored hinges.