DOSMENU 2 has different customizations to use own backgrounds
The configuration options for Background are as follows:
Background=<Path to Background image file>
BackgroundPosition=[0|1|2]
The Background option points to the Background image file (BMP) on the local system. Relative and absolute pathes are supported (e.g. bg/dosmenu2.bmp). If no background file is entered, the background will filled with the background color (see How to use Colors for more information).
The BackgroundPosition option configures how the Background image will be displayed. Either top-left (0), centered (1) or tile (2).