Noticed there are a couple of existing hacks for the GBC Konami Collection titles, separating out the Castlevania into their own standalone officially-colourized games.
Would be nice to see the same treatment for at least the Gradius/Nemesis games in these sets (if not the other games as well, maybe Parodius, Motocross Mania, Quarth... any of the games that were released as B&W GB standalones, really)
Similarly, Pac-Attack was released for the original GB and then later included, in colour, in "Pac-Man Special Colour Edition" for the GBC alongside a colourized version of GB Pac-Man.