What form(s) are everybody's recipes in? I'm guessing Microsoft Word-type documents (and PDF files) and internet / web bookmarks. How about just taking a look at the table of contents of a general-type cookbook (e.g., Betty Crocker) and make folders: (1) appetizers, (2) soups, etc. Then drop your recipe files into the correct folder.
From there, you can make sub-folders (cream soups, clear soups, whatever).
I don't have many recipes and I've had to reorganize my files a few times. I have maybe odd-sounding folders: "bean dishes," "breakfast," "one-pot-pan," etc. As long as it makes sense to me, I'm happy.