The problems I can see with the question are that:
- How you name the directories of your hard disk probably depends from which files you have. I would think that you don't call a directory "Butterfly pictures" if you don't have butterfly pictures; you could choose that name for not making clear what the content is, but in that case, you could choose any random name.
- The answers to that question would be arbitrary, as there aren't any rule you are forced to follow while choosing the name of a directory. Probably you would get different answers about which name to use, as every user has a preferred schema to use for choosing the name to give to directories.
- There is no relation between the name of a directory, and English grammar; you could use a name such as "ABBDDE," "Le mie fotografie," or a random sequence of letters and numbers.
In the first case, if you were more detailed with the type of files you have on your hard disk, the question would be even more localized.
In the second case, as every answer would be equally valid, the question would be a poll, which is the kind of question that are not welcome anymore. If some very old questions are polls (where by very old I mean questions asked during the beta phase), now such questions are not welcome anymore, considering also that Community Wiki questions have a different meaning, now that every user can edit every question (although users with a reputation lower than 2000 need somebody who review their edit).
In the third case, the question is not even about the English language and its usage. The question is similar to the questions about the name to give to a function; the difference is that some programming languages some words are reserved, and they cannot be used as function name. In both the cases, there isn't any relationship between the chosen name and English grammar; in the case of function names is more a matter of the programming language grammar.