Just a quickie here, can you make folders within the library to store you own bits and pieces. Ive just done a small design piece and saved it in the library but its gone in to the kids bit section and id like to make a folder to store it in there to keep them all together.
I don't think I've ever heard of using sub-folders for libraries. Libraries are, by definition, multiple images under a common name, so they are folders, in a special sense. Some of the libraries contain over 100 motifs.