Aqua Button

First, create a new image, 250x100 pixels and fill the background with the color that you like.

Use Custom Shape Tool [U] to draw a shape that you want your button to look like.

Now is the time to add Inner Glow to your shape. Right click on the text layer and select Blending Options...

Layer Style window will open, select the settings that you see on the screenshot.

In the Layer Style window select Bevel and Emboss on the left and use settings that you see on the screenshot.

In the Layer Style window select Satin on the left and use settings that you see on the screenshot.

In the Layer Style window select Color Overlay on the left and use settings that you see on the screenshot.

In the Layer Style window select Gradient Overlay on the left and use settings that you see on the screenshot.

In the Layer Style window select Stroke on the left and use settings that you see on the screenshot.

Press ok when you done and your image should look like mine.

Congratulations, now you know how to create aqua-style buttons in Photoshop.