We're now going to make a black border around the image. Right click on the layer and choose duplicate layer. You will now get a new layer that's selected. Press CTRL+T for transform, in the top of the screen, you can edit the percent of the width and height of the image. Change both of them to 99% and then doubleclick on the image to accept.
Make a new layer by pressing the new layer button in the layer window:
Press 'D' to reset the colors to BLACK-WHITE, then press ALT+BACKSPACE to fill the whole layer with black color. CTRL+CLICK on the 'transformed layer' you made. (If you use Photoshop CS2, you have to CTRL+Click in the little preview image in the layers-window)
Press DEL on the keyboard to delete the black color where the transformed layer were. You should now have a border that looks like this:
We are now going to make some black lines in the middle of the image so we get 'boxes' for the different colors. Click on the 'Rectangular Marquee Tool' (Hotkey: M). And make a selection from top to button that has about the same width as the border. It should look something like this:
Press ALT+BACKSPACE to fill the selection with black color, press CTRL+D to deselect.
You should name make select the new 'box' you've made, use the 'Rectangular Marquee Tool' for this too. (if doesen't matter if you select the black border too) When you've selected it, it should look like this:
Click once on the 'transformed layer' (should be the second from the top on the layer window). Press CTRL+U to get the 'Hue/Saturation' window up. Change the Hue to change color in the selected area. In my example, I choosed Hue: +40.
Press CTRL+D do deselect the selection.
We're now done with the image and here's my result:
If you want, you can make one more black lines and change the color on many places in the image. And you should know how to to that now
I made one more color and here's the result:
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That way you should be safer when adding different color parts as well I guess.