They're pretty, but also pretty useless. Besides the bug, cookies, coffee cup, and lock all of them require text in addition to the icon in order to make sense

They're pretty, but also pretty useless. Besides the bug, cookies, coffee cup, and lock all of them require text in addition to the icon in order to make sense. Even the filetype icons include textual descriptions. They're also too complicated for use in most scenarios (especially the computer icons). Additionally, the package icons won't make sense to anyone who isn't a coder, and possibly not most people who don't have non-Windows experience. Pretty and shiny, but for real work I'll stick with something like the Tango iconset (or hire out custom designs).