We have featured a number of really good Ubuntu Unity concepts before, here is another one which supposedly deals with the trash button in Unity more efficiently.
Ubuntu Unity Desktop Concept
- The idea proposes an Android-like system where the trash icon only appears when you are dragging something.
- This saves space in the dock and would be a lot more responsive than an icon in the dock could be.
- Also, panel and menu uses the grey from the ubuntu colour palette.