FastIcns for Mac

From Digital Waters:

With an innovative and easy-to-use interface, and you can create your own icons in a few steps.

• How does FastIcns work?
  Pick your favourite file, folder, or image and drag it over the cube then check the preview and then double-click the cube to save as an icns file, as a resource fork-only file or as a PNG image. Or you can drop another file holding the Command key to assign it the icon.
• Which image formats are supported?
  FastIcns supports all common image formats, including transparent images and Windows icons. Just try it! ;)
• What happens if I drag in a generic file or folder?
  Its icon is captured in order to proceed to icon generation. It can be useful if you want to convert icons from a format to the other.
• What's an icns file useful for?
  You can provide it as an icon for a bundle. For example, Mac OS X applications use this format for their icons.
• What's an icon in a resource-fork-only file useful for?
  That is the kind of file you'll find for example on interfacelift.com to distribute icons, as these files provide an immediate preview in the Finder and are easy to copy icons from. So this is the format recommended to distribute your icons too!
• I see my picture rotated in FastIcns. What can I do?
  The Edit menu contains some simple editing functions to rotate or flip your image before the conversion.
• Can I assign the icon to an already existing file or folder?
  Yes. Choose the item "Assign to file or folder" from the File menu. As a shortcut you can drag the target file or folder over the cube pressing the Command key: you'll be asked to confirm changing its icon.
• Can I convert more than one file at the same time?
  Yes. Enable the batch conversion mode from the menu or with Command-B and play with it: double click on the cube to configure it and drop files to create icons.