First of all you have to design your skin in a graphics program like Photoshop or GIMP.

In the designing process you should think of the following components:

A main window containing:

a play/pause button

a next and a previous button

a faster and a slower button

a stop button

a time slider

a volume slider

a mute button

text information about the current playback

other buttons with specific functions like shuffle,repeat or making other windows and dialogs visible

A playlist window. Either integrate this into the main window or create a separate window for it. The playlist window should contain:

a button to add and a button to remove items from the playlist

a button to export and to import playlist files

a button to sort the playlist alphabetically

An equalizer window. This might also be included into the main window or elsewhere. This window should contain:

A slider to control the preamplification

10 sliders to control the different bands (60Hz, 170Hz, 310Hz, 600Hz, 1kHz, 3kHz, 6kHz, 12kHz, 14kHz, 16kHz)

A button to turn the equalizer on/off

When you create your skin also consider that each control/button has three states: normal, mouseover and clicked.

For example you could create a big image for each window, where the window with it's controls is shown three times. One for each status. Then it is recommended that you split up this image with slices. (Slices refer to a tool in Photoshop, I don't know how or whether at all this is possible in GIMP or other programs). Then save each slice, or subimage, as a PNG file.

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