I do not know, if it is from Metroid (own that game, but did not play it at all). Most likely it is an artwork or painting. And yes: I mean Metroid for SNES, but it can also be one of the GBA-Games.

I do not think it is from SNK or something like that.

But, cant you take the background from the game? It has to be in one of the folders o.O