A texture is an image, usually a small rectangular tile, which contains a pattern. This pattern is often designed to wrap at the right and bottom edges so that the tile can be repeated across and down a window and appear to be continuous. PMIO allows a texture to be applied to the thumbnail panel in order to enhance its appearance. Windows comes with several textures (usually in the Windows folder) which are designed to be used as desktop wallpapers. You can also use these with PMIO if you wish.