Here are some interesting snippets for creating 3D progress button styles where the button itself serves as a progress indicator.
A nice hexagonal progress bar with percent number inside. Free PSD designed by uidynamics.
Trance FM is a set of simple web elements (buttons, toggles, progress bars, etc.). Free PSD designed by Alexey Anatolievich.
Round progress meter is a free PSD containing a cool rounded progress bar with complete percentage. Designed by Marco Moreno for 365psd.
Free PSD of a OSX loading window with a coloured progress bar. Designed by Alexandre Naud for 365psd.
An intricately detailed slider graphic with a brushed metal dial and subtly striped progress bar. PSD freebie designed by Andrea Ballerino.
Light progress bar PSD freebie designed by Ivo Ivanov.
Analog clock made up of progress bars. Inspired by Piet CSS snippet on Codeopen. Source: The Open Dept.
A dark downloader window. PSD freebie created by Matt Bilbow.
A stylish loading bar. A PSD freebie designed by Seeger Mattijs.
Clean and minimal progress bar. A PSD freebie designed by Ivo Ivanov.
Simple colorful loading bar free PSD designed by Garrett Godsey.