Folders2 is an updated folder icon set, working off my first set which you can find here. Below are the images and links to the new folder set; if you need a folder that seems missing from either set, feel free to post a response to this post with what you need and I'll add one for you. - euphonic
Edit: All images have a transparent background and are of proper size ratio. Thanks for pointing out possible confusion, chiaroscuro.
Image Package/ / /Want the entire set? Download all the folder icons in this handy-dandy .zip pack! Click Here!