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Basic Push Button
First make a new image 200x200 pixels, then create a new layer.
Use the elliptical marquee tool to make a circle selection
(Hold down shift key to draw a perfect circle)
Press D and X to reset the background color to black and foreground white.
Then use the Radial Gradient to fill the circle from top left to bottom right like the picture on the left.
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Now go to Select>Modify>Contract, enter 6 for pixels
Then go to
Edit>Transform>Rotate 180
Go to Select>Modify>Contract, this time enter 2 for pixels
Then go to Edit>Transform>Rotate 180
To color your button, Go to Image > Adjust >Hue, check the "colorize" box and adjust anything there untill you like.
Apply any layer effects you like, for example drop shadow, bevel & emboss...etc