Who to make a new skin with gwen on gmod 13 ?

Hello,

Who to make a new skin with gwen on gmod 13 because in need to modify skin on darkrp ?

SKIN.tex.Window.Normal = GWEN.CreateTextureBorder( 0, 0, 127, 127, 8, 32, 8, 8 )
SKIN.tex.Window.Inactive = GWEN.CreateTextureBorder( 128, 0, 127, 127, 8, 32, 8, 8 )
SKIN.tex.Window.Close = GWEN.CreateTextureNormal( 0, 224, 24, 24 );
SKIN.tex.Window.Close_Hover = GWEN.CreateTextureNormal( 32, 224, 24, 24 );
SKIN.tex.Window.Close_Down = GWEN.CreateTextureNormal( 64, 224, 24, 24 );
SKIN.tex.Window.Close_Disabled = GWEN.CreateTextureNormal( 96, 224, 24, 24 );

thx all.