Create a file and save it as Skin.dat, this will contain information for your skin. This file will be an ini file, here is the setup:

  [Info]			; Basic information header
  Title = Black-Yellow		; Give a title to your project
  Author = Valuater		; Your Name

  [color] 			; Theme color header
  background=0xFBDE03 		; Back-ground color( GUI back-ground )
  Button=0x979898 		; The color of the XSkinButton
  mouseover= 0xABA9A9 		; The color displayed when the mouse is over the control or button
  fontcolor= 			; The color of the font - blank = black
  [settings] 			; Setting information header
  size=50 			; Set the displayed size of the all the images that make the skin
  [icon] 			; Title bar Icon information header
  style=yellowpnt		; The "theme" for the icon(all icons are in the skindefault folder)
  Isize=17 			; Set the displayed size of all the icon images
  adjustleft=30			; Adjust the icon left from the windows width
  adjustdown=5 			; Adjust the Icon Downward from the top of the windo
  

Change the settings to your liking and make it look nice