I found these forums while on a search for steampunk/Victorian OS X themes, only to find that they didn't exist.
So I made this set of icons in the last few hours, and decided, as a regular purveyor of Brass Goggles, to join and share these.
The goggles are Finder, the pressure gauge is Dashboard, iCal needs to display the date so I can't replace it, the stamp is Mail, the compass is Safari, the victrola is iTunes, the speaker is last.fm, the toy duck is Adium, the hand crank is Transmission, the projector is VLC, the globe is Firefox, the quill and ink is TextEdit, the typewriter is Pages, the camera is Photoshop, the photo album is iPhoto, the frame is Preview, the guitar is GarageBand, the oscilloscope is Activity Monitor, the gear is System Preferences, the stack of books is Downloads, and the elephant foot trash can is Trash. Originally I replaced all the folder and drive icons with old looking books and the document icons with weathered pieces of paper, but that was too much and made it annoying to navigate.
Addendum: These half-sized images don't really do them justice, but that's all my Photobucket will let me upload.