Drag and Drop: Can you prevent the drag sources from covering drop sources on hover?

Hello,

My drag sources tend to be very large and the drop sources very small.  (I know its usually the other way around).   I have set it up so that the drag sources "disappear" when they are dropped, but while they are still hovering over the drop sources, they completely cover them.  Is there a way to make them semi transparent or shrink when the are hovering over the drop sources?

Thanks for any help!