Desktop Carousel's Applescript support adds the following properties to the Application class: 'picture name', 'picture url', 'picture homepage', 'picture path' and 'changes'. See the Basic Script Examples folder for examples. To install the scripting examples choose the Help > Install Scripts Examples menu.
After Desktop Carousel has downloaded a picture and before it changes the desktop it will execute every compiled Applescript (in alphabetical order) it finds in the ~/Library/Scripts/Desktop Carousel/On Download folder. See the On Download Handlers Examples folder for examples.
Example: How to display desktop pictures in 'black and white' by using the 'Handler ColorSync BlackAndWhite' example script:
Or, if you have already installed the example scripts, open the Desktop Carousel scripts folder by choosing the Help > Open Scripts folder menu.