Well, there haven't been a lot of themes posted here, so I decided to share mine with others who might not know how to do so or have my awesome photoshop skills. 
(isn't Android about customization?)
New release (August 24th)! There's no big change, except that the Power Control Widget acted weird when you pressed them (it changed color, but not really correctly, it's a detail. Now fixed.) Also I removed the background for the application drawer, because I now use ADW launcher and the tray is somewhat transparent.
Anyway, I didn't make this theme for others, I made it for myself. I didn't plan on sharing it, and it's in no way a complete makeover for your Galaxy. I wanted a few things to be different, so I changed them, and I constantly mess around with this theme.
What I use: Galaxo 1.6.3.3 with Helix on the screenshots, I now use Galaxo 1.6.3.4 and ADW launcher from the market (with root explorer I went and deleted launcher.apk, so I get all my memory. Ask if you have problems).
DO A NANDROID BACKUP FIRST!!!
Note: To install Helix launcher, download this one, get into the recovery, fix package permissions, apply any zip and select HELIX.zip (if you download from the market, your phone will be slow: the original launcher is locked into memory, the one I gave you will overwrite it. I recommend using ADW though.)
GalaxOrbit-1.3
How to install:
-Download the GalaxOrbit-1.3.zip and extract it.
-Download and install Metamorph on the market (there's a free version).
-Run metamorph once.
-Place the extracted theme folder in the new "Androidtheme" folder of your SD card.
-Run metamorph
-When the check is over, select the bottom right option (Existing themes), and select GalaxOrbit-1.3
-In there, select GalaxOrbit-1.3.xml and then the bottom right option (Apply all). Answer yes to the prompts they give you, and there you go!
Screenshots (the Google logo in the search bar is now back to its original color):
FAQ:
What are the changes?
The power control widget is now transparent, same goes for part of the music widget. The notification tray is now transparent too, with some lightning effects. The application tray background now has a texture (it's plain dark with Helix launcher). The Google icon in the search bar now has colors (NOT ANYMORE, check edit at the bottom), and the icon for the stock music and video apps were changed. You can see all those changes in the four screenshots. The beach background was added too.
Why GalaxOrbit? That's a stupid name.
No reason, it's one of the first words starting with O that came to my mind (it was almost called GalaxOhMyGod, GalaxOrbit doesn't sound too stupid now, eh?)
What's the time widget?
You can see it in the screenshot where the app tray is opened, it's called Digital Clock widget
(isn't Android about customization?)New release (August 24th)! There's no big change, except that the Power Control Widget acted weird when you pressed them (it changed color, but not really correctly, it's a detail. Now fixed.) Also I removed the background for the application drawer, because I now use ADW launcher and the tray is somewhat transparent.
Anyway, I didn't make this theme for others, I made it for myself. I didn't plan on sharing it, and it's in no way a complete makeover for your Galaxy. I wanted a few things to be different, so I changed them, and I constantly mess around with this theme.
What I use: Galaxo 1.6.3.3 with Helix on the screenshots, I now use Galaxo 1.6.3.4 and ADW launcher from the market (with root explorer I went and deleted launcher.apk, so I get all my memory. Ask if you have problems).
DO A NANDROID BACKUP FIRST!!!
Note: To install Helix launcher, download this one, get into the recovery, fix package permissions, apply any zip and select HELIX.zip (if you download from the market, your phone will be slow: the original launcher is locked into memory, the one I gave you will overwrite it. I recommend using ADW though.)
GalaxOrbit-1.3
How to install:
-Download the GalaxOrbit-1.3.zip and extract it.
-Download and install Metamorph on the market (there's a free version).
-Run metamorph once.
-Place the extracted theme folder in the new "Androidtheme" folder of your SD card.
-Run metamorph
-When the check is over, select the bottom right option (Existing themes), and select GalaxOrbit-1.3
-In there, select GalaxOrbit-1.3.xml and then the bottom right option (Apply all). Answer yes to the prompts they give you, and there you go!
Screenshots (the Google logo in the search bar is now back to its original color):
FAQ:
What are the changes?
The power control widget is now transparent, same goes for part of the music widget. The notification tray is now transparent too, with some lightning effects. The application tray background now has a texture (it's plain dark with Helix launcher). The Google icon in the search bar now has colors (NOT ANYMORE, check edit at the bottom), and the icon for the stock music and video apps were changed. You can see all those changes in the four screenshots. The beach background was added too.
Why GalaxOrbit? That's a stupid name.
No reason, it's one of the first words starting with O that came to my mind (it was almost called GalaxOhMyGod, GalaxOrbit doesn't sound too stupid now, eh?)
What's the time widget?
You can see it in the screenshot where the app tray is opened, it's called Digital Clock widget
