Here's something I believe to be interesting. According to many, Fire Red and Leaf Green are considered to be the definitive versions of the first generation of Pokemon games, mostly due to using a newer game engine and being devoid of many of the issues that plagued the original game. However, it's just me, but I feel like the presentation was, well, cheapened, due to the GBA being a much more powerful console, and most graphical aspects of the first games were explicitly designed with the monochrome GB in mind. Plus I like the music.
So my question is, would it be possible to replace the graphics and music and other miscellaneous stuff with the original gen 1 assets? Basically it would just use the engine from Gen 3, when everything else is from the first game, if that makes any sense.
Another idea is more along the lines of being a question, would it be possible to hack NES games so that they're 'optimized' to run on a GBA emulator? The GBA has a smaller display than the NES (240x160) vs the NES' 256x224), so I was wondering if it would be possible to hack certain NES games so that their menu bars are raised/lowered and made more compact, as well as some minor level/camera adjustments.