The VG Resource

Can anyone link to any tool or tutorial for that? Google is a dumbass and don't return any satisfactory result.

I'm pretty sure this would be similar to ripping from modern PC games. That is, extracting from the files (or RAM dumps if completely necessary). I haven't done it with MS-DOS games myself but I have looked at Windows 95 games (Warcraft 2 and The Neverhood) and those have their resources in archives like most PC games.

Is there a specific game you're looking to rip from?

All down to specific games as Puggsoy said - I've ripped from a couple, but again, only where tools are available or the game is stored in a super simple format.

I wanted to give a shot on Turrican II.