SimpleDefault
This theme is a simple theme, that isn't cluttered, just a very clean, unified interface. It has a drawer on the left side of the screen on all 5 of the screens.
It is based around the idea of having a green background. 
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That is all from the same screen. I wanted to show you what the multiple tabs look like. All the other screens are about the same, just with different tagged trays. I also have 2 "tabs" that, instead of launching a tray, Launch an app. 1 is the settings app, and one is astro.
Here is the wallpaper I used just in case you wanted it.
This was designed on my G1 so it might not look good on bigger screens like the droid, or nexus one,
but I'll be getting an N1 in a week or so, so I can fix it for my next version.
I am open to any suggestions.
Search for SimpleDefault to find the theme, or search for SliestDragon.