Copying Images Question

Hello,

Does anyone know how to change the way OS X copies images when you drag them?

When the images are equal to or smaller than 1024x768, you the standard small ghost image that follows the cursor until you release to copy. But, if you're doing the same thing with images that are equal to or smaller than 1600x1200, then see a jpeg file icon instead of the ghost image.
What I'd like to do is to change it to always show the file icon when dragging to copy instead of the smaller image. Being able to toggle back and forth would be nice.

Any help is appreciated,