I'd like to rip the background layers of the Volcano stage, but this is almost impossible to do with vram, since this particular background has a blinking palette effect and vram doesn't load all of these palettes, only the current one.
I had the same problem with Mario World & Alcahest and solved it through this:
Basically you capture the animation (in your case, with Screenget or Animget), throw everything on a sheet and then try to make lucky quicksaves. Throw the quicksaves into VRAM, compare the frame from the internal VRAM preview screen with the frame from your sheet and add the palette below the frame on the sheet. This way, you can always keep track on which palettes you already have.
It's like operating a slot machine.