ClipToIconCM is a contextual menu plug-in which adds custom icons to files using pictures on the clipboard.
Suppose you have a file with a generic icon and you want to add an icon that conveys more information on the file's contents.
You can add a custom icon to this file using ClipToIconCM by first putting an image file on the clipboard. For example, you could use your Web browser to find a Web page with the desired graphic and then use "Command-Control-Shift-4" to select a portion of the screen to "capture" to the clipboard.
Then in the Finder "Control-click" on the file you want to add the custom icon to, more...