Plaster is an application used to plaster images on folder icons. The first method is to drag any image file from the Finder to the plaster image in the application’s window.
The second method is to drag over a folder containing one or more image files. An image will be chosen at random from the image files in the folder and will be displayed. If you like the image chosen, hit the button with the Plaster icon.
Plaster is available for free.