Hello everybody, here is the tutorial on how to create custom background for multiplayer main menu.
First of all, download required tools from here, read and understand the instructions given by House.
Then follow the next tutorial:
https://img534.imageshack.us/img534/2514/37388610.png
https://img248.imageshack.us/img248/1817/62257723.png
https://img816.imageshack.us/img816/8350/99657785.png
https://img408.imageshack.us/img408/2517/18559742.png
https://img502.imageshack.us/img502/2431/74766903.png
https://img338.imageshack.us/img338/3379/57089963.png
https://img573.imageshack.us/img573/4348/20701741.png
That's all. Note that you can also alter the glow in main menu (menu_mp_background_glow.iwi) in the similar way.
Credits:
63OR63 - for this tutorial
House - for texture modding tutorial
~DownFall~ - for tutorial on MW2 menu altering