PhoneFinger uses its own .hand format to bundle hand graphics and related information. In addition to those that are built-in, PhoneFinger will use .hands from 

"~/Library/Application Support/PhoneFinger/Hands".

A .hand file is actually a folder — you can right-click on it and choose "Show Package Contents" to look inside. Inside of a .hand package are the images the hand uses as well as an Info.plist file.

So, to make a hand, just drop all the images and a customized Info.plist into a folder whose name ends with .hand, and drag it into the Hands folder. You'll have to restart PhoneFinger for the hand to show up.

If you make anything particularly cool, let us know and we'll put it on the PhoneFinger site for others to use!

-- Info.plist Reference --

The Info.plist file is in property list format. You can edit it in any old text editor, in the Property List Editor that comes with Apple's Developer Tools, or in a tool like PlistEditPro.

In the Info.plist file, you can specify the following values:

PFHandName
    The readable name of your hand. Displayed in the hand model menu in the app.

PFHandAuthoroptional
    The person or company responsible for the hand. Not displayed currently.

PFHandAuthorWebsiteoptional
    The URL or email associated with the above. Not displayed currently.

PFHandDescriptionoptional
    A description of the hand. Not displayed currently.

PFHandVersionoptional
    A version number for your hand to distinguish newer versions from older ones.

PFHandUpImage
    The filename of the image that is displayed when no mouse button is pressed.

PFHandDownImage
    The filename of the image that is displayed when at least one mouse button is pressed.

PFHandHotspotX
    The location of the active part of the image (where a click will actually happen) expressed as a number of pixels from the left of the image 

PFHandHotspotY
    The location of the active part of the image (where a click will actually happen) expressed as a number of pixels from the top of the image 

PFHandMinScaleFactoroptional
    A number from 0 to 1.0 expressing the ratio to which your image will be scaled when the user selects the smallest size. You must also specify PFHandMaxScaleFactor if you specify this property.

PFHandMaxScaleFactoroptional
    A number from 0 to 1.0 expressing the ratio to which your image will be scaled when the user selects the largest size.