I know I will probably make most laugh, some angry with my first post but here goes anyway..
Many years ago I was given a file with MAME and batch files to run each game. Back then I didn't know anything about MAME, I just liked playing the old games in a window on the desktop (no UI). So I made artwork surrounds (before I knew what a Bezel was, or a CPO, Marquee etc.) just to make them look pretty when I played individual games I would just change the desktop wallpaper for that game. I have made over 80 (1920px x 1200px) artworks and the thought occured to me that maybe I could have MAME put my artworks into the game file, turns out you can. So my first question for you good people is, can I use my 1920x1200 .png files in MAME?
edit: Of coarse many of them, if not all are what may be termed non-official, more like made-up in my head.