Liana,
You sure can! I have seen some real cool steam punk items out there including phone cases. Amazon has bunches of gears and such you can get for a pretty good price. I do most of my "findings" shopping on Amazon. Saves driving all around town to find what I am looking for. Although I have found some cool sale items at Michael's too. If I find cool stuff and it is on clearance I grab it. Also dig around in your "junk drawer" I also have a tin full of old buttons that are real cool. ;-) Second hand store jewelry is great too.
Jeannie