It's been a few decades, but you can finally play Samus Aran's stark second adventure in living color. No, we're not talking about the Metroid 2 remakes (fan-made or official). We're talking about a fan-made patch that brings all the colors of the rainbow to her 1991 Game Boy title.
The patch, which you can find on Romhacking.net (thanks, Resetera), is a re-writing of a previous patch that was complete, but quite buggy. It also contains additional graphical improvements, according to its description.
Metroid 2 received its first taste of color with the Super Game Boy, a 1994 SNES add-on that gifts Game Boy games with a limited palette. While Metroid 2 looks decent on the Super Game Boy, this new patch gifts the game with a palette that's roughly equivalent to the NES.
If "old" Metroid 2 isn't your jam (it has some great ideas, but its gameplay is a bit limited), there are options. A stellar fan remake titled Another Metroid 2 Remake (AM2R) was released in 2016, but Nintendo's copyright department shot it down as soon as it took flight. You should still be able to find it, though [cough]. If you want something more official, 2017 brought us Metroid: Samus Returns for the Nintendo 3DS. In my opinion, they're both good for different reasons.
Metroid 2 has always been a controversial entry in the Metroid franchise. Whereas most Metroid games encourage combat and the exploration of biologically diverse areas, Metroid 2 sends you plunging int the bowels of the Metroid home world of SR288 on a hunt-and-destroy mission. While it's true ferreting out Metroids before taking on their Queen isn't always exciting, Metroid 2 boasts an impressively foreboding atmosphere for a Game Boy game. There isn't anything else quite like it, not even in its own series.
In any case, maybe playing (or re-playing) Metroid 2 in color will ease the wait for Metroid Prime 4.