Here you can find 56 mockups, but probably these are “just” screenshot of NLD 10 (Novell Linux Desktop).
Here what I think about some of these screenshots.
I like the idea of show graphically the volume level, actually the volume applet just show a simple tooltip with the volume percentage. I like this, but IMHO this is better because it has more ticks and is rounded, but maybe these are confusing because seems to be clickable…so probably this is the “best”, but it should show with different colors if the level is too high and so on, like in the others examples.
There are also two mockups of the volume applet that show how to change the volume level, this one is very simple, I like it. In this you can also change the single application volume level, this can be useful.
Also the menu was rearranged, but I don’t know what to think because this is too important.
I also like the panel, but I think potentially it’s the same of the current panel with different icons
OK That’s all, I think this is a good point of starting, and there are some good ideas…