Here is one of my favorite theme.
It is called Water, designed by Delik.

If you are one of the iPhone fan, you should have this theme.
This is because most of the icons are converted to iPhone icons, so that you will have the iPhone feel.

As for me, i like the water moist that look so darn real.
It kind of giving me a nice and comfort feel everytime i look at it.

Notice that selected menu will glow in yellow color.

One of the drawback of this theme is the icons are not details enough.

If you want to add this theme to your collection, you can download it free from here.
Water 07 by Delik

Or if you have QR Decoder, decode this and download directly to your phone.